Well, I've been using one of these for a few weeks to contrast it with the Pen. My initial thoughts: it's light but solid, and quite a bit like a smaller version of my EOS 600D, down to a very similar hinged LCD. The thing feels quite nice. It has a reasonable spec except that it has no video - perhaps not a dealbreaker for many people, but an odd omission on a CSC. It only has one control wheel - my preference is for two, but again, not a dealbreaker. It's got just about every other feature you might want, really. However, where it starts to fall apart is in actual use. I hate the menu structure, and find I keep going back a level rather than selecting an option. The EVF - well, it reminds me why I detest EVFs. The contrast is vile, lag is awful - a nasty experience all in all. Image quality is decent enough - on a par with the E-P1, for sure. Problem is I don't see it as any real comparison with the E-P1; for me, the Pen has one massive advantage - it's small enough to fit into a pocket. As such, I can forgive it an awful lot; however, the G1 just won't fit into a pocket. As a result, it needs to hand around my neck or go in a bag. That being the case, what advantage does it have over my 600D? And the answer is - well virtually nothing. It's a fraction smaller - although actually a touch longer from the back of the camera to the front of the lenshood than the 600D and 18-55 IS - and a little lighter, but not enough to make any real difference. Against that, the Canon has a proper viewfinder, a decent menu structure, much better image quality - and numerous other advantages. The end result is that I just can't see why I would use the G1 in preference to one of the other cameras - I simply think this camera in particular, and the EVIL type of CSC in general is just completely pointless. But it's still a nice enough little camera on it's own.