I think they're silly, not very practical. Kinda like me. Not always practical but fun. But I gotta say, the one's I've seen have had some VERY smelly people riding them. Up in Minneapolis, Peeeeeeeeeeeeeeeeeeeeyewww. Luckily, at the party after the race, they challenged each other to a jousting match, and ended up leaving the party early due to blood loss after the un-cushioned 2x4 used as joustes knocked the teeth out of one of the dudes. Fun for me to watch, but not very practical, especially when I'd bet my paycheck that these guys didn't have any dental insurance.
Not that I enjoy seeing people get hurt, but the smell left with them.