DH and I got them after a friend of ours was killed by an (allegedly) drunk driver (public records still don't disclose the results of the blood test) while riding home last June.

If you're on the fence, I got an email from them with a 10% off coupon code that may help: pcSAVE10, valid through 12/7/10.

I may order a smaller band for mine. I ordered one, thinking I'd want the extra length to put over a winter glove, but I vastly prefer it right on my wrist, under things, and it's just a whisker too big for me. I'd like less length, and it's not something you can trim after the fact.