Smaller and lighter than most of its competitors--and most dSLRs--the GH2 nevertheless gets pretty weighty when paired with the 14-140mm kit lens. But it's generally comfortable to grip, with a nice shooting design.
The GH2 supports Pansonic's Micro Four Thirds 3D lens, which consists of dual f12 12mm (24mm-equivalent) lenses. The camera simultaneously shoots a 2D JPEG using one of the lenses along with a 3D MPO file.
Although the grip is relatively featureless, it's deep, rubberized, and just high enough to work comfortably. I also like that Panasonic puts the SD card slot on the side rather than in the bottom battery compartment.
The GH2's controls are pretty typical for Panasonic, and easy to feel and operate. While the programmable function keys increase its flexibility, though, with these types of designs I can never remember how I customized them, and it ends up slowing me down rather than streamlining my shooting.
Panasonic uses a jog dial to toggle between exposure compensation and whatever the primary dial function is (for instance, if you're in shutter-priority mode the primary dial function is changing shutter speed). As long as you're not prone to accidentally pressing it, it's a pretty efficient control mechanism.
Panasonic doesn't shy away from direct-access controls on the GH2. On one side you can set focus mode and focus area/type (face detection, tracking, multiarea, and spot). On the other you've got a somewhat crowded mode dial with the typical PASM, auto, and scene modes, as well as advanced movie capture and three custom-settings slots, plus drive and bracketing options. My one gripe is that manual movie mode, where you can adjust a lot of parameters, is on the mode dial rather than being available more directly.