I only fly a few times a year, and my expensive Samsonite luggage is all but destroyed. It gets so beaten up by the airlines that we can't even get one of the suitcases open, and the other won't roll anymore. These are hard sided suitcases with latches.
So, this time I think I am buying something cheap with a zipper. I like having something hard sided for breakable souvenirs, but I still have one. I borrowed a cheap big suitcase my Mom bought at Marshall's and it faired better than my pieces. I think I am going to buy something similar, and if it gets screwed up, c'est la vie.
When my dd gets older and starts getting her own seat, I will get her a little rolling Disney suitcase. I think they are cute, but not worth the money for the quality, I am afraid.