theyre good if your bindings have already pulled out, but they dont hold up to any kind of shock at all, they start to fall out after a bunch of heavy landings making them pointless if you ski park a load.
People do helicoil new skis but it's a waste of time and money and I've seen them done really badly, then they're a bitch to fix or even worse you're left with huge holes in your skis and need to remount 2cm forward or back.
yeah i thought about heli-coiling my skis when i was mountain them, but i'd rather have that as an option as repair, rather than huge holes in my skis.