I just got some lightly used(at least they appear that way) 2006 Mavic Ksyrium Elites. They are true, and the hubs/bearings feel smooth when I spin the wheels. My only concern is that when I spin the front wheel, it seems to stop quicker than all of my other wheels. Like I said, it feels completly smooth, it just doesn't spin for that long.
Ride without worry or go straight to LBS?