I like the idea behind these, and I also think that they will probably incorporate some kind of optional (or possibly even customizable, like different colors and stuff) sidewalls for people who don't like the way they look. On the other hand, they were coming out soon at least three years ago, so I don't know if they've scrapped the idea, or if they're still working out the bugs. I could really see these things ripping apart if you were to swipe a curb with them though!