I'm 6'3 and just started riding my 250r this week. It can get up to speed with no problem, even highway riding was more than manageable. Its light weight seems to be more of an issue than lack of speed - moderate winds will push it around. Currently, I'm finding it to be a little uncomfortable. My knees come up just above the curve of the fairing and tank, so using my legs to hug the bike puts some awkward pressure on them. I find I can alleviate that by riding with my toes on the pegs, allowing my knees to come down a bit. That's not ideal, though.
I haven't found the bars to be an issue - not a whole lot of full lock steering, even at parking lot speeds. Consider rear sets, I'm trying to get some feedback on those as they may help keep the knees tucked in under the tank while keeping proper footing.
