Originally Posted by Seattle Forrest

Enve wheels come with a 5 year warranty, and have a reputation for toughness. That warranty is almost certainly for the first owner only.

Older Zipps have had trouble with hubs. I don't know enough about this to be very useful, but if you go with Zipp wheels do your homework.

I wouldn't buy used rim brake wheels, but everybody is different in their tolerance for risk.