I have the tire sparx....

Originally got the purple to match bike trim, but they weren't that bright. Then, got the red/white/blue for hubby, and ended up borrowing (stealing) them because they are very visible!

I do love my down low glow, but I wouldn't have chunked out the money for it myself (I'm kinda cheap-what can I say?). DH got it for me for Christmas, and I must say that I'm really pleased with it.