My dad is about 270lbs. He has a lot of fun on the raptor and feels at home with the size and power availible. The ds is very nice, but it becomes less attractive in trial environments due to its much larger stance and lack of reverse. Its a little faster stock though.

 

tell ya what the raptor is awesome because i own one and a new 450 yfz from yamaha, thay are both good machines if u want a quad that accelerates fast the 450 is it! but if u want a quad that has it all (bottom&top-end) then go with the 660 raptor. I love both of my quads!!!!