I bought this set 4 years ago and have been using them usually 2 or 3 times a week, sometimes more ever since.
They are great cases, the material is strong and water resistant, the zippers are well designed and sturdy and handles are good on all cases except the bass drum case..(The handles become a bit tangled when carrying the drum in one hand as the handle is attached at by two metal clasps..works fine when carrying in two hands). The stitching has lasted nicely too, no visible stretching or damage to the cases.
Overall a very good set of budget friendly cases. Once you mind your drums and don't throw them around you shouldn't have a problem.