A few guys have been running quad bike bars, and have been happy with them.
I'd add that modern bars are lower to suit the more modern riding style of putting weight over the front. If you ride like that, then the modern bars will help rather than hinder.
I'm 6'0", and find that the lower bars give me MORE room, rather than less - more of a MTB riding position. Tall bars tend to push my weight back and make me even slower than normal.