When I bought them on a Craftsman Club super-cheap deal a few years ago, they were marketed as more of a stubborn-fastener remover, kinda like an easy-out wrench.
They actually worked quite well in that respect.
As far as being $50? I don't think I'd pay that much for them. They were "worth it" for the $30-$40 I paid for them new, but at $50, I'd live without them.
I've got a set, because they were part of a larger set.
I've used them a few times. Haven't found the use that justifies having them yet. If they weren't part of a set I was already getting for other reasons, I think I'd just skip them over.
I have them. There design grabs and removes stuck fasteners.The times i have used them they did real good but for 50 bucks ill pass. Its more like $30 for the SO torx and $20 for the wrench set. You can get them at sears outlet for $20