I bit the bullet, and picked up the M5 last week. I like it better than the 3600 but that's mainly due to the software. The only thing that I do not care for is the lack of a real compass. Battery life is great so far, and I really love the user changeable battery over "you gotta the send it in" 3600. Now I need to find a quality Wifi SD card for it.
Anyone else got one of these?