I actually had a 640Adv before the 950SE, and had two sets of wheels for it in an effort to use it as an only bike. It didn't have enough power for my riding with my streetbike buds, so I upgraded to the SE. That cured the power problem without giving up much, if anything, off-pavement. I guess the SE was kind of a compromise between a big street or adventure bike, and a 600-class dual-sport. It was huge fun, but I was trying to talk myself into selling it within a year of buying it. It took over 4 years to convince myself to do it. But, I was really missing riding in the woods, so I sold the SE and got an old 'Zook streetbike and a 530EXC. The 530 is kind of a compromise between a 600-class dual-sport and a true woods bike: manageable in the woods, and bearable on the street. Now, oddly enough, what I miss most about the 640 is riding it on the street. I love a big thumper on the street. So, the 690, helped by some recent discussions with friends who plan to get one, is on the radar. I guess to cover all my riding bases, I need three bikes.