I'm downsizing. This will be my sixth bike overall, and fourth BMW (R100 – R1100GS – F800GS – G310GS). I enjoy riding off tarmac out here in the western U.S., and that often means picking up the bike when it decides to take a nap. The 310 weighs 100 lbs. less than my current F800GS (which I'll be selling), and that should make that task significantly easier.
Now that I've turned 60, horsepower alone doesn't really mean all that much to me anymore. If it can keep up with U.S. highway traffic, and all of the reviews I've read so far indicate that the 310 is perfectly capable of doing that, then it should do what I want it to do.
It'll probably be a year at least before I can take delivery here. But the F800GS will keep me happy until then.