Just went from 1150GS to 1200GS
I just traded an R1150GS (not even a GSA) for an R1200GS and I can really feel and appreciate the difference in weight, power, and the better, less top-heavy feel of the 1200. And my 1150 wasn't even a GSA. No offense to those who ride and love their older GS's. I just know from having orthopedic and back issues that 60lbs. and a somewhat different frame and design that the 1200 just seems easier to balance and handle.
I'll bet you would really feel the difference moving from the Adventure. If you haven't thrown a leg over a 1200 yet, you're in for a pleasant experience. (Different enough for me to buy the 1200 the same day I first rode one.)
2013 R1200GS K25 (Camhead) Triple Black
2007 F650GS Dakar
“Life is what happens to you while you're busy making other plans.” ― John Lennon