Get the PN Stealth. The metal frame will really come in handy on your day off when you're kicking back enjoying a frosty instead shopping for a replacement bag for your next trip, and taking your broken unit to the store for repairs.

If you can't get the best, get the worst...and throw it away when it breaks. If you get something middle-of-the-road it will still break but it's too expensive to sh*t-can so you will have to get an extra rollaboard to use when your regular rollaboard is in the shop for repairs (about twice a year).