I did a LOT of research before getting mine. The unicyclists definately get a bad rap from the common clown association, but you would be surprised what they do on unicycles these days.

As far as the size, it's bigger than I'd like it to be (had to get one for my 6'4" body) but I'm told it's only practical at larger wheel sizes. Which makes sense. The clowns have this little tiny wheel, which is great for control and tricks, but for any sort of commuting / riding a distance, the larger wheel gives an obvious speed advantage.

I must admit I do get some strange looks and conversations from passers-by as I practice outside. Kids always ask to try to ride it.

crazyjeremy