I'll just throw out there that the DYMA Aero covers are an alternative to Aerojacket. They're very similar, with the largest difference being that the DYMAs have a radial cut, and are designed so there's some overlap between the two edges of the cut. This sounds bad vs. the solid Aerojacket cover, but I've really liked it in practice. It effectively removes the "wave" issue, and makes installation a breeze - you can mount it without removing the wheel from your bike. It's much quicker to install, and the seam from the cut really doesn't bother me. It's pretty discrete, and you can tape it over if you want.

[for the record I have zero financial interest in DYMA - just pimping a product I've liked quite a bit]


[Photo stolen from DYMA's web site]

maybe you already know this (i didn't)...but the drive side of the powertap hub just pops off. so you can put the cover on easier without having to deal with the cassette. I thought i broke something the first time this happened.

I train and race with aerojacket on a Reynolds Assault. Even with Michigan rough roads, I've never seen a bolt come loose. Can't say that for the POS Specialized Aerobottle. That fell off one time too many yesterday. It's being replaced by Torhans.