First off, I travel with my two small children four times a year to cover about 22,000 miles.  I've spent several hundreds of dollars on a single bag before, and I've also spent under a hundred on others.  This set is highly affordable and of good quality.  My three year old daughter can even push the 29" one fully loaded without any trouble.  The bag itself is light, which enables you to fill it with more of your stuff.  They are bright and unmistakable.  No one else can walk away with them quietly.
  I first bought one set in purple, and subsequently bought a second set in orange.  Each time the sets arrived fast (AMZ Prime). I used the sets to go from the U.S. then to South America. Yes, this *nesting* set is a combination of a softside with a hard plastic on the bottom and sides, making it stiffer, more durable, and it has a front pocket.  I own true hardsides, but I prefer this hybrid style.  The zip pulls (with integrated loop for a lock) stayed on after two legs for the orange set and seven legs for the purple set.  The zippers and the wheels still work well.  The colors are still bright.  I define a leg as when the bag has to be transferred to another plane.  This set of three is better and cheaper than two separate pieces at the local discount store.

  The nesting feature allows for a smaller footprint when storing and when traveling.  I normally leave home with the middle bag filled nested in the larger bag.  This means that I can go to the airport in a smaller car.  When I return, I have both bags filled.  In the 29" bag, I have packed a new desk top printer still in its box.  In the second 29" bag, I fit a pizza toaster oven, though I had to remove the packaging and expand the bag.  Both arrived perfectly fine in working condition without any special treatment.
  I highly recommend this set.