I have a friend that owns a pair of these. He has let me make use of them at a range and borrow them for hunting. These really do work as described. There are especially useful hunting when I want to be able to hear low decibel sounds (of course while doing that not used for listening to music) while protecting against hearing damage from shooting. As you say though they are expensive.
http://www.midwayusa.com/product/187...uffs-nrr-33-db