Saw a woman out on
one of these the other day. Looked kinda fun, but she was all over the road, weaving back and forth. I'd hate to meet her on a MUP.
I've seen a similar unit on two wheels which I think would be preferable. The three wheels rob you of the ability to lean in the turns I would think.
I've ridden upright tricycles, and they scare me in turns.