I had 27k miles on my car at the 4.5 year mark when I sold it. Drove the piss out of it (considering I live in Oregon where it rains 8 months a year). Had the fiberglass seats in it, and never had an issue really. If you're going on a long trip, you just strategically place some folded up towels on the "hot spots". If you can get in and out of the car, you'll be happy. Worse case, you're either too big to fit in the seats (that doesn't happen very often) or you're sliding around inside it for track days (make a bead seat).

First year I had it, Bolus and I drove to Oklahoma for Atomfest1. Met McFred along the way. Had a blast, but in that first year racked up more like 7k miles