Just bought a new suitcase today. We had two TravelPro Platinum II rolling garment bags and I found they were great. I also have a Tumi rolling 22" and 2 cheapie 22" rollons. I have also discarded my softsided Samsonite and American Tourister rolling garment bags due to broken zippers.
Here is my opinion and I travel a lot. Tumi is well made, heavy and very expensive. I received mine as a gift and do not find it superior in quality to the Travelpro luggage I purchased. I find rolling horizontal garment bags quite difficult to pull through trains and narrow spaces and that it doesn't hold sweaters and jeans without bulging uncomfortably.
I found that I was able to get a lot more loose things into my 22 inch rollalongs and that I loved my expandable models. The cheapies have held up VERY well for over 7 years.
I was very dissatisfied with the high priced Samsonite and American Tourister because the zipper systems broke very easily and neither company would stand behind the repairs. My equivalent Travelpros have taken tremendous abuse and is still holding up well after 3 years of heavy use.
I purchased a Travelpro Flightpro3 due to its upright shape, nifty pockets (dirty laundry bag, removable toiletries bag, around the neck ticket/passport bag, removable garment bag, waterproof lining, large zippers, high density balistic material and lightweight construction. The Tumi is terribly heavy, even empty! I noticed that the large uprights are what the Europeans use on trains and that they are easy to move about in crowded places. Also, with the new weight requirements, a lightweight bag allows some more clothes.
BTW, I paid $161 for a 26 incher and find this seems fair. I don't think you need to spend a lot or get anything fancy for your roll-along carryons.
Just a few thoughts to help those looking for luggage.