I've got an '05 12GS, and while I like the engine much more than the 1150 models I had (smoother and more powerful), there's a bunch I don't like about it.
When I give it gas to accelerate (normally from lower RPM's - say 3500), it sure seems to take a lot to really get going.
Yet when it's about 5000 rpm, now matter which gear it's in, the bike zooms.
I would like this dead spot in the middle of the RPM band to go away.
But, I'd also like to keep my good fuel economy.