I always wonder why people who are selling their cameras always speak so glowingly of them? ;-)
At the risk of jinxing my sale, I think the GRD2 is very nice but not ideal for me. I like to shoot people but with a wider lens - a 35-40-50mm on 35mm is great, so even though GRD2 has a 28mm-equivalent, it actually shoots more like a 35mm lens, at least with the 4:3 proportion. You can distort faces and foregrounds for sure, but if you are thinking you can either use it to advantage or minimize it.
It is a small sensor but the image quality is quite good, low ISO color is clean and higher ISO 200-400 B&W conversions really do look like Tri-X on my Leica. The biggest practical difference for me with the small sensor is the depth-of-field is huge, which renders a lot of people pictures sort of flat and 2-D. I knew that upfront and wanted to try it -- I actually enjoyed the challenges involved but frankly I see it as a novel effect, not something I want to run with for a body of work.
Where I think the GRD2 is ideal is as a street shooter's camera. The small sensor and deep depth of field is a big advantage here, having tried to shoot street wide open with larger formats it is a crap shoot -- with the GRD2 you're going to get Leica-Tri-X quality and almost always nail the focus even at f/2.4. That's awesome!
I also like the little viewfinder and the option to compose with the LCD, which is going to be more accurate than any RF and also easy on my recently farsighted middle-aged eyes.
Not to flog my sale too much -- I'd love to keep mine but I can only afford to have so many cameras and I am a minimalist -- I don't like having too many choices. So I am not in a particular rush to unload it but I'd like to get close to breaking even.
If you're a street shooter it is worth trying. If you want "normal" portraits not so much ;-)