Yes, it's pretty comprehensive. I read it last week on my Kindle, am about to re-read it. It contains some nuggets like the sensor clean is automatically executed every time you turn it on. I didn't know that and certainly didn't get it from the manual.
So, the book worth the investment, or just a rehashed manual? I have a couple of websites on E-M1 set up that I like and refer to pretty frequently.
I bought his book on the V1 when i had that camera and it was a rehashed manual... I made a note never to get his books again - others may think differently
With its examples, I definitely think it is better than the manual. I am yet to use a manual over an outside source.
Re websites: biofos.com has some config advice and a linked spreadsheet. Barry Sent from my iPad using Mu-43
Thanks, I do have that one, very helpful. There's also this one: http://photolisticlife.com/2013/10/17/olympus-om-d-e-m1-user-guide/