I am 6´3, 11.5 stone, and it fits me fine. It will do 60 mph on the flat, that is run in but restricted. I have no idea how to de-restrict it, but would love to find out! It does about 95 to the gallon urban, I use for for commuting every day and it is fine for the job. I looked at loads of bikes, most 125´s made me look like I was on a kids bike, the XR is great though, I don´t swamp it at all. Also, the distance between the seat and the pegs is high, so you don´t have your knees up high when riding, unlike most I have sat on. It does get to smelling kind of hot if you keep it at full throttle for a long time (20 mins plus) but I haven´t noticed any problems because of it. When I say full throttle though, I mean full throttle, on duel carriageways. For handling, it isn´t the most nimble because of it´s physical size, but it is nice and skinny for filtering through the traffic and it is light, so can be easily moved about. Also, it comes with a rack, which is well handy for everyday use. Hope this has helped... if anyone knows how to de-restrict this machine, please post!