First off, I have to say that the "gunmetal" finish is quite nice in person, more so than the pictures lead you to believe. My superficial self was a bit worried that it would look ugly on the silver e-m5, but it looks fine. The lens is the size I thought it would be, but it's pretty heavy compared to the tiny primes I've grown accustom to. Thinking the grip would be nice to own when this lens is attached, but it's far from unwieldy. The zoom ring is fairly stiff at this point...definitely won't be any creep in the foreseeable future. Pictures are great thus far, just playing around the house. Focus is fast, typical for all the m43 lenses I've used. I'm a bit disappointed that there's a speck of dust (or something) between some of the rear elements. I can't see it in pictures, but it is a bit annoying to spend this kind of money on a lens and see dust inside. Is this something that can be removed in servicing? I don't have the option of return (bought on ebay). I like the range this lens gives...12 is quite a bit wider than I had expected, and even gives a bit of "fisheye" like look when viewing through the finder. 12 is the widest lens I've used (pana 14 prior to this). Overall I'm pleased with the lens. I wish I didn't have to pay so much for it, but that's what you get for being impatient.