I've never owned a PNT, but I've seen plenty of messed up ones. The PNT is very strong and durable right up until it gets a fatal blow. The first time a ramper pitches it out of the cargo hold, ot it "accidentally" gets run over by a tug, the frame is permanently and irreparably tweaked. The PNTs also seem very heavy and bulky.
I've always used a Travelpro. It is simple, light, rugged, and easily repaired. They have a 3 year guarantee for flightcrew use, where they are repaired or replaced scott free. You either take it to a local shop, or send it in. We get a discount of almost 50% off through ASA. I had my old one over 5 years, then bought a new one last year for about $120.