I have those, the big crystals at the back. One crystal fell out and another one fell off completely. I have it but I don't know how to put it back on the shoes.I have a pair of the superstars with the bigger crystals. Mine are also ok but I baby them - have had them over a year
I decided not to get too upset about it and just keep wearing them. I got them second hand and if they break I will just replace them with new ones.