Aesthetically they are very appealing, clean lines without any cables, and they can be fun to ride for short distance, but I get annoyed with them rather quickly. Mostly because I live in a college town and there are a lot of people who pick up bikes out of the trash and want to make them fixed. (Half of this sentiment comes from my boyfriend who is a bike mechanic and has to deal with these stuck up students frequently).

I've ridden one before and understand the 'one-ness'. It is neat to feel the immediate connection between the motions of your legs and the movement of the bicycle, especially when slowing down. That said, I'll stick with a single-speed for the clean lines. I like coasting down hills.