I just got to my computer and will try and give my feelings on this camera. If you do not plan on adding any of the fixed lens modules, M mount module or the forthcoming APS-C zoom, I would probably not buy this setup. However, if your intentions are to grow into the GXR system and how long before you add to it might change my advice.
That being said, I really like how the Ricoh "system" is made to include the menu system, button customization, and build. If you haven't held and shot a GXR then you might not be able to understand what I mean.
I'm very happy with my fixed lens 28mm focal length. Sure I'd like to have a little more reach, but then I just move my feet a little closer. My dilema is do I purchase the 50mm module, wait for the forth coming APS-C zoom, or buy the M Module and add a couple longer focal length lenses to complete "my" system preferences.
BTW, I had a chance to "play" with a GXR with the M module and I think it was the Voigtlander 35mm lens. I keep hearing people worry about how easy or hard it might be to focus with that setup, and I can tell you, it was a piece of cake! Within about 5 seconds I had it figured out.