They work great for some applications! Just don't get too cute like I did and try to use them for landing gear mounts with aluminum 4-40 screws, or you may find that the aluminum galls to the brass. Silly stunt guy was trying to negate the added weight of the brass. Oops! Work fine in that application with regular hardened 4-40 though, and I still use for those, because yeah, cutting into a plane to chase a slipped blind nut is no fun. That said, a properly installed Dubro blind nut is still probably the best and lightest option. The cheap knockoff blind nuts are the only ones I've ever had trouble with, because they are stamped, soft and thin. You can actually see the cheap ones pucker in the center if you really crank them tight, the little teeth sheer off easily and then will spin. I still have not found any superior to the Dubro.