we love our eBags brand hardside suitcases from eBags.com . Lifetime warranty, and they have endured travel well for a number of years, including all 4 of our
DCL crusies. We have quite a few different eBags products and are quite happy with their products.
That said, part of the factor is what size you are looking at. Also, hardside or softside.
For example, the eBags EXO 2.0 hardside bags (
http://www.ebags.com/search/b/ebags/bc/exo-20-hardside) in the 24" size (the checked bag size; 24" box; 27" actual with wheels and handle) are deliberately designed that size so it is hard to go over the usual 50 lb limit. I can attest to its effectiveness, at least for us: the highest we have hit was 42 lb, but are otherwise always under 40 (usually 32-37). We each have two.
Now, I have bigger suitcases -- I have a really nice REI softside one but don't usually use it for travel now that we have the eBags ones. Although it took some adjusting, I do like the EXO size: I can navigate with it easily (it has 4 spinner wheels); it rolls well over most surfaces (carpets take a little practice, but I found if you apply just a bit of downward pressure it rolls fine... each time we go over carpet there is a bit of adjusting to get it right for that carpet ;-) ). In fact, I can navigate, myself, with: two 24" (pullhandles back to back, held in one hand) each with a carryon bag slid over the pullhandle and have a free hand for another bag or whatever. are they perfect ? No, there is a couple things I would tweak if I were to design a 3.0; but those are "nice to have" things that I can live without.
Even if you don't purchase from them, I recommend the eBag site for helping inform your choices: they carry MANY brands, as well as their own eBags brand. Suitcases, purses, travel accessories, backpacks; a whole bunch of similar types of products. They generally have EXCELLENT information about each bag, plenty of reviews, and pictures and sometimes video that let you get a really good idea of what the bag looks like and its different features. often they have more info that the manufacturer website will.
SW