Love this set.  Took it to Paris on a 10-day trip.  Well, the middle and smaller ones.  So easy to spot on the carousel, and no question that it's mine (especially since I have my name on them in silver Sharpie on the black supports on the back and around the handle).  The wheels/handles all held up well.  Didn't try to piggyback them, so I have no opinion on the strap.

My one quibble with the set is that the smallest bag has straight wheels instead of spinning wheels like the other two.  This would have been so much more convenient on the small one.

In any case, they held up remarkably well considering how much was in them!  Minor scrapes and scratches is all.  I'm not sure whether to thank the manufacture or the airline, but for once, I made it through a trip without the handle breaking on a suitcase!