The design is really great - love it. So far none of the corners curl up (we have the threads between 3 floors) and the pads don’t ripple at all - they stay nice and flat. Only issue is that the glue didn’t last over 2 weeks, so we will have to put something else to keep them in place. But honestly I have not found any stair threads which don’t move. If you can deal with giving it some extra glue yourself, then I’d really recommend them. They are beautiful and give a contemporary look.