I agree with Caper on the hands, I don't know if it's me, and cause I'm relatively new to riding, but I've loosened my grip and especially my right hand likes to doze off. I'm thinking of a throttle lock too so I can flex it a bit.
I've got a 07 650, and the seat is no better then the 05's. It's fine when just booting around the city. But anything with distance and my arse starts getting sore. A 3 hour ride is currently excruciating. For the mean time I'm going to get a Pro Pad I think, an friend on a Maruarder picked one up no more pain in the ass :d
Other then that, the hand thing doesn't really bother me at all. The seat does, I love my bike. This is my first bike, and I'm probably going to have it for a very long time. I'm still breaking it in, only 1200km, but I was able to finally get out on the QEW on the weekend, and the throttle response was snappy as all hell.
Passing anything was no problem at all. As for ATG's quiet factor, I agree, with my face shield down I barely hear the thing.