It's my wife who is the E-3 user, not I, but as someone occasionally called on to help out with it (so not really accustomed to it) I observe that:
(i) I don't know how to select and move around the focus points. This should be EASY but seems to involve a lengthy trip to a menu - not something I'm going to try in the heat of the moment.
(ii) The camera's indication of battery status seems to be erratic, to say the least. It will frequently signal "Battery Empty" (stupid expression) within a few frames of newly-charged batteries being inserted. I'd be interested to hear how you get on with batteries in extended use.

In theory the 4/3 lenses are great - my wife uses the 150mm f/2 plus converters so gets a 300mm equivalent field of view with a huge relative aperture - but the autofocus speed seems to be a let-down when tracking moving subjects. How about you have a go at a birds of prey flying display and see how you get on with it?

Looking forward to reading your thoughts!

Cheers

Steve