I've had my TravelPro rollaboard and Office Depot chart case for 15 months now, and am happy with both.
The TravelPro is holding up wonderfully, with zero repairs made so far. Right now I plan to replace it with another TravelPro whenever the time comes, but I would definitely get a PNT if I was a commuter. It's rock solid and can stand up to being tossed around by rampers, but I can't justify the weight otherwise.
My chart case is starting to show the wear from being handled by too many rampers on too many DHs, but it's nothing a little bit of black speed tape won't fix.