My new used wheels: how good are these?

[PCC]

I bought a set of wheels from a co-worker who had them sitting in his garage for the past 10 years. They are Matrix ISO-C II rims laced with DT double-butted spokes onto a set of Campagnolo Record 36 hole hubs.

I know that Campy Record hubs are a standard by which other hubs are compared to but how are the Matrix rims?

These wheels are giving me a headache: I weigh 150 lbs and I plan on losing 10 lbs. My nephew has been riding my RB-1 and he's only 120 lbs. These wheels should be plenty strong enough for the both of us. The problem is that I would like to modernize the bike and the fact that the rear hub is not a freehub and 36 holes is a concern. Should I be concerned?

Thanks!