Pros Light weight
Cons Nothing worth mentioning
Summary I've been happily using Panasonic DSLRs, superzooms, and now 4/3rd and micro 4/3 cameras for some years, and I'm well aware of their previous limitations, especially noise at high ISO settings and slower focusing than DSLRS. The GH2 conquers those problems. I took the GH2 to East Africa for three weeks, with 14-140 and 100-300 lenses, and the results are spectacular: animals, birds, street shooting, video-all what I wanted from this outfit. Noise is noticeably lower than previous Panasonics. Focus locks on quickly. Burst shooting is more than adequate for all but sports photographers. The body's size and light weight make it a pleasure to use, and the controls are where they should be. Switching from still mode to video mode and back is quick and certain. I've never enjoyed using any camera as much as the GH2, and II've used a wide variety, from Box Brownies as a kid through Leicas, Rolleis, and Hasselbalds.
Pros Compact size
Video is excellent
20mm F1.7 lens is excellent
EVF is very good
Using manual focus lenses is very good
ISO1600 is clean
Touchscreen focus and shoot is neat - getting interesting shots from it.
Cons low light performance not on par with the best (i.e., Pentax K-5)
2.5mm mic socket is a PITA (Dear Panasonic, most of the world is 3.5mm)
No monitoring of audio
Colors are a little "plastic"/oversaturated
Summary I'm a Pentax shooter that was very tempted by the new K-5, particularly it's low light performance and dynamic range. But I'm getting more into video, and decided to sacrifice a little still performance for the best video on the market. I'm not disappointed. The video is drool-worthy. And the stills? They've been a pleasant surprise; on par with my K20d and a step behind the newer Pentax K-x (esp in terms of low light).
The fact is, all dSLRs and ILC/System cameras made in the last 5 years are capable of stunning images....in good light. The difference between the best and the has-beens can be seen in challenging light situations - low light, high contrast, etc... And so it is with the GH2 - great in good light, ok in challenging light, and left behind by the best in candlelight. Still, if you struggle to take a good photo with this camera, consider photography lessons before blaming the gear LOL.
I'm blogging my real world experience with the camera at What Blog is This - http://whatblogisthis.blogspot.com/search/label/GH2