My brother and I gave this a trial run the other night. It's about a night and day difference (maybe more) between having them and not having them on your bike when riding at night.

Drivers, pedestrians, cyclists all notice you. They give you a wider berth when passing, and make sure that you give them the go-ahead before they make their turns.

At under $5, you can't go wrong! (This is the first price drop I've seen in the past several months).

Nite Ize SKL-03-07 SpokeLit LED Safety Light for Bike Wheels, 5-Color