My GF1/20 is in hand. First impression is that it 'seems' smaller than it really is (in comparison with my G1).
Everything set up easily, shot with 20, 17, 14-45 and had my FD 35 f/2.8 on adaptor so tried that. MF is not difficult--if the light is right to see. That will continue to be my bugaboo, but I do know the EVF is coming. In shadow or protective place to shoot from or interior--the cat's meow as they say. I put my CV 35mm finder on and its good with that for 20 and 17--but focusing is harder to do unless stopped down. I tried various methods and can work it out, but not the best solution IMO. I'll be glad when I have the EVF in hand--knowing its not anywhere near G1's quality, but that's okay--when I need the very good one for very low light, etc.--I'll carry the G1.
All in all, looks like a keeper. I need to shoot with it this week and see, but for what I want it for (smaller to carry with one or 2 small lenses, second body, casual videoing, more discreet)--I think it will work just fine.