I hope I cover some things not seen in other postings or online reviews, so you will not see what is typically mentioned. This is more about my initial set-up, 4/3s lenses and some other things I noticed. Background - I'm used to the Olympus 4/3s E-5, E-30, and the m4/3 E-M5 with the HLDR-6 which I have pretty much left the horizontal portion of the grip on all the time. I also regularly shoot the D800 and D7100 and make over 45,000 photos a year. My primary interest in the E-M1 was for a few primary reasons; to enable my use of the 4/3s 12-60mm and 50-200mm lenses (both have SWD), for better ergonomics and to get away from the nuisances of the E-M5. Interesting to note is my E-M1 came with 209 actuations and the flash was fired 9 times according the camera. The only reason I checked is the screens that normally come up first time, to set time and such, did not do so. The camera was immaculately packed like factory fresh though so I did not see this as an issue. The first thing I noticed about the E-M1 was the near E-M5 size! After mounting the 12-60 I was surprised that the camera didn't have the same feel as the E-M5 with HLD-6 horizontal grip. I measured the cameras today and the E-M1 is .165" (about 5/32") (4.2mm) shorter than the E-M5 with the horizontal grip. And after using both the 12-60mm and 50-200mm lens for two days I am really surprised at how much that 5/32" makes a difference. The E-M1 is also .36" (nearly 3/8") (9.15mm) longer yet was harder to notice the difference. Next on my puchase list is the Really Right Stuff L Bracket! This should even up the dimensions and satisfy the way I'd like the camera to feel with these lenses. On set-up of a camera I'm inclined to keep as many buttons at the default settings if there is no way to save my custom settings, which I do not know of a means with the m4/3s. If I have to reset the camera I don’t want have to make the numerous changes before I start shooting again. But here are a few things I ran into right away. I set up the Super Control Panel (SCP) to show when pressing the OK button, Custom Menu D, Control Settings, P/A/S/M, check Live SCP (I also uncheck the Live Control). Since first using the E-410 the Super Control Panel (SCP) is great! However as I used the E-M1 the SCP is not nearly the benfit it is on on previous Oly cameras due to the controls on the E-M1, but it is still really handy. I also wanted to find out the size of the small AF targets and see if I wanted to use them. Wup, sure do. Note- About the same size or a little smaller the 14X focus targets on the E-M5. Press the Info button when you have the AF target selection screen up (if in default settings press the Fn1 button), press the Info button, then the up or down buttons till you see the [.]s at the bottom of the left hand corner of the LCD. It is interesting to note that I could not find a way to select a group of small AF Targets so this may not work well for all shooting conditions. I've kept the focus beep on to ensure I know what the camera is doing. I'll turn off the Focus Beep once I'm accustomed to how the camera focuses. Custom Menu D, Disp/PC, the speaker icon (second form last in the D menu), Off I also noticed as I was shooting that the colors seem to be saturated and in Auto ISO (which works pretty dam good and something I'm not accustomed to using) the pictures were a little warm. The camera comes preset with Natural Picture mode. I tried a few other modes and have attentively settled on Muted and turned off Keep Warm Color - Custom Menu G, WB Auto Keep Warm Color, Off. In keeping with the idea of using as many as the default settings as possible here are some things I have not seen mentioned. These and the rest of the defaults seem to make a lot of sense. HDR Button - pulls up to 2 sets of options and viewed in either the EVF or LCD, whichever you are using. Top (Controlled by the front dial) - HDR-1, HDR-2, 3F 2.0 EV, 5F 2.0EV, 7F 2.-0 EV, 3F 3.0 EV, 5F 3.0 EV (any of these selections also sets the camera in High Speed Sequence shooting) Coool - Preset bracketing, with high speed sequence engaged with one button!!!! Bottom (Controlled by the back dial) - Single, Hi (Speed Sequence), Low (Speed Sequence), 12s (delay), 2s (delay), Time/# of Pictures (1 sec, press Info button to select 1-10 images) AF Button Top (Controlled by the front dial) - ESP, Center Weighted, Spot Highlight, Spot Shadow Bottom (Controlled by the back dial) - S-AF, C-AF, MF, S-AF and Manual, C-AF Tracking Fn2- Multi select, Press and hold the Fn-2 button while rotating the back dial to select from Highlight and Shadow Control, Color Creator, Magnify (which it does not seem possible to use this to change the AF Target size as on the E-M5), or Image Aspect Ratio On the front of the camera Front top button (the one with the depression) - One-touch White balance Front bottom button - Preview button (this would probably be the first button I'd change) AEL/AFL - default is Exposure Lock Lever by the AEL/AFL button, Default is Mode 1 or Off (I'm not sure which is the default as my camera arrived with the lever option set to Off, but the manual states Mode 1 is the default) , Custom, Group B, Lever Function (5 modes of operation - for now I'm thinking of the KISS principal) Position 1, Dial functions defined by assigned dial functions Position 2, Front dial: ISO Rear dial: White balance So with the few changes I made I found the camera very capable and can change all necessary settings with one button except ISO and WB, which is still very accessible by the flick of a lever! The ergonomics, ease of use, and resolving the negative nunces of the E-M5 were all achieved with the E-M1! And for making common changes on the camera, I'd say the E-M1 equals the D800 and maybe exceeds it. About 4/3s Lenses I used the 4/3s lenses the first night and two days now shooting about 300 photos. Initially in decent light I was happy with the focus speed, but when it comes to dim light - the E-M1 is no match even for the E-30 with 4/3s lenses. By dim I'm talking about shooting where an exposure is in the area of ISO 200, F/2.8 at 1/25 or about 8EV. The camera prefers high contrast focus areas and probably averages bout 1/2 sec to lock focus. My trials were in a room with a few incandescent bulbs, tonight just after sunset, and trying to capture a few pictures of Halloweens on our dark street. I could not even lock focus on the headlights of a car driving by about 20mph. I'm interested to see how it does in night street scenes and other situations. But if I was going to use this camera for events in dim areas professionally, I'd definitely be using m4/3s lenses. BTW- the focus illuminator did not seem to make anything quicker, maybe in darker situations. So for now I've turn it off as it is annoying - Custom Menu A, AF Illuminat, Off. I went out for an afternoon walk around and was really amazed at the number of time the camera and 4/3s lenses would not lock focus. I was using the small focus targets and did notice that the outside focus targets locked focus better than the center targets. Amazing! Even in full sun and lots of contrast. The camera also locked easier on subject matter with vertical lines than horizontal and it didn't take much to seem to confuse the focusing to some degree. I'll have to try the larger AF targets and see if that makes a difference. At his point I'm not thrilled with the 4/3s lenses AF abilities. Well I don't know what I just did, but I locked the WB settings so it could not be adjusted. So here comes my first Reset! Initial thoughts about the E-M1 Overall it is a step up from the E-M5 which makes it an extremely good camera. If you have high grade or super high grade 4/3s lenses, I think you will may be somewhat dissatisfied compared to an E-5, E-30, or E-3. I'd suggest borrowing or renting one before buying. However it is far better than using these lenses on the E-M5 but I'm disappointed I sold the E-30. If you have an E-M5 and thinking about an E-M1, it is an expensive upgrade for what you gain. Yet worthy if you want or need the additional capabilities of the E-M1 and/or dislike the buttons and ergonomics of the E-M5 layout. Many seem to like the E-M5 without the HLD-6 grip in which case the E-M1 is not significantly larger than the E-M5 and will not require any larger cases. However if you do like the horizontal portion of the HLD-6, the E-M1 presents a mix bag. The grip portion is great but the camera lacks the small bit of height of the HLD-6 horizontal grip provides. If you are coming from a dSLR, it will be some growing pains with all of the options and how things may work differently than you are used to. But the size and weight difference, and the dSLR like capabilities make it worthwhile. I will caveat that by saying that my D800 is not being replaced!