I got a G1 a few days ago and and very impressed with it. If I had one misgiving it would be that it feels a little flimsy and plastic (I'm much more used to solid metal cameras). But obviously this is also one of its attractions - it is a light camera that is easy to carry around all day.
I have a lot of manual focus Nikon lenses and I am thinking of buying an adapter, but I am slightly concerned about using the bigger, longer, heavier ones like the 75-150mm on a small plastic camera for which it wasn't designed. The smaller lenses will present no problems, but has anyone had problems or concerns with bigger lenses on the G1?