Wasn't sure four cuffs on one center strap would actually hold, but everything stayed put even with a lot of movement. The adjustable cuffs fit both of us comfortably, and setup took maybe five minutes the first time.
The cuffs are sewn on properly, no fraying or cheap stitching. I love that I can just slide the whole thing under any mattress and have it ready in a minute, no tools needed. The center strap holds tight even with a bit of pulling.