The quality is a not too great but if you need a lightweight compact trolley for occasional use it is ideal. I have five fairly heavy steel containers stacked on mine and it is easy for me to move them about now. For the cheap price it can't genuinely be faulted.
I bought the 25 inch for my last trip to Greece, it is a tenth of the price of the very best of this type of zipped suitcase but it did the job very well, the wheels stayed on during the airport handling involved with the three flights I took and the handle remains rock solid. There is an internal divider which zips all round inside so it has two separate compartments. I am very pleased with it so far, and really for the price you can't fault it.