I'm also rocking the disco model. They seem to attract a fair amount of attention, so I'm happy.

I run them solid. I had decided that they don't change color in flashing mode, since they seemed to always be red. Guess I'll have to re-check that.

When I spin the wheel on a repair stand, there's a noticeable out-of-balance wobble from having just one on each wheel. While riding, though, I don't really notice it.

For ~$5 USD each, I think they're well worth it if you regularly ride in traffic.