I just bought a 70-300 VR from UsedCameras.com. It seems like the zoom is a little tighter than on my 18-55 VR. It is perfect other than that, and maybe it's o.k. I actually like it a little tight so it don't accidentally move while shooting.
It has a 60 day return policy so i'm not really too concerned, but just curious if anyone is familiar with what i'm talking about. It's smooth, just a "little tight."