First off, have you heard the speakers, and are you sure they’re the ones you want?
No, crossovers don’t go bad. As for the drivers, unless you’re foolish with under or over powering them, or crank up the volume too loud, you shouldn’t have any issues. I would check the dealers credentials (go to Paradigms web site & make sure he’s an authorized dealer) and get his guarantee in writing. If that all checks out, then you’re probably OK.