We needed two medium size suitcases, as the ones we have had for a long time were about worn out.  We still have two really large ones, and two carry-ons, but we needed to replace the others,  We have used them for a few plane trips and car trips, and so far they have performed as expected, and they are easy to move on their wheels.  We even ordered a third one for a different purpose, as the price of these is good.