We were standard-issued the soft sided TravelPro rollaboards. Pieces of crap in my opinion. They did NOT hold up to being slammed around the cargo bins of the ATRs all day. I demolished two in 3 years. My dh is on his third, his luggage didn't have quite the rough life mine had, so his TravelPros have lasted a bit longer, but even his newest one has needed several repairs. I highly recommend the rollerblade wheel conversion kit.
After destroying my second TravelPro, I got a hard-side Samsonite. I will never travel without it again. I've used it as a chair, footrest, step-stool, pillow, and oh, yeah, I pack stuff in it too. The rollerblade wheel conversion is an absolute must though, the factory wheels suck.
The Purdy Neat Stuffs are very heavy, even empty. I've never owned or used one, but I hear they are very durable. They're soft-side, with a metal frame. Very expensive, but from what I've heard, you get what you pay for.