I don't have one, but am very eager to get one...I'm pretty sure my stock wheels on my P2 are one of the few they can't be trimmed for. Everything review I've seen is very impressive, especially considering their cost compared to an actual disk (like 1/15-1/20th cost). I've also only heard good things about wheelbuilder as a company.

I have one for my Mavic SSC SLs. Used them once on a training ride. The install is kinda a whip: You have to remove the entire cassette, then line up each side of the disk and fasten the opposing disks together. Totally easy if you have a chain whip, but not really a quick change. And definitely you can't/shouldn't train in them regularly. They aren't made for every-day use. For the cost on race-day, it's a no-brainer. If you look at ebay for Zipp stickers, you could buy some Zipp rim stickers and throw them on there. You wouldn't be able to tell the difference when moving.

Yes, there is only one thing that sounds like a disk wheel on sew-ups, and covers do rattle a bit against the rim. And maybe I wasn't sarcastic enough about the Zipp stickers, but it was kind of a joke, like the guys who put the stickers of their brand of air filter or muffler on their cars.

The only thing I did not like about my Ch Aero covers are the color of the fastners (silver) you can paint them black but who knows.