I owned an R12GSA for 24000 miles. Sold it and bought a KLR650 for 15000 miles. Crashed it and bought the F8GS. I had the opportunity to ride my old 12 yesterday in Daytona. (Thanks, Dan.) I am completely satisfied with my choice of the 800. The 1200 felt sluggish (it was in tune) and o'brother heavy. The rotax engine was smoother and the bike was far more responsive to throttle inputs. On the 12, it was like I was driving a supertanker. I'm 6'2" and 190 lbs. I have no fears about riding big bikes. I put 54000 on a K12LT. But the 800 is such a good comuter which is where I spend most of my time (sadly). For the long haul, the 12 would be great, as long as you weren't working crowds or dirt at the distant end. With some windshield work, I think the 800 will compete with the 12 just fine for distance runs. Unless you want to run a microwave. The missing 320 watts is significant. I'm not a dirt rider, so I'm not making an evaluation of the off-road capabilities of the 800. I know there are better bikes out there for the technicals. But for me, it was a validation of my last purchase choice because I was offered a great deal on another 12GSA and passed it up to take the smaller bike. I'm satisfied.