I bought a pair for trap shooting. They are very comfortable, but awkward to insert. They don't cut the sound nearly enough on the firing line. If I stick the tiny plugs into the holes, they are _almost_ quiet enough, but then they aren't so comfortable. They do block quite a bit of sound, even without the tiny plugs inserted in the central holes, so you can't hear well with them in.
They are quiet enough to wear outside, away from the shooting line, and you can hear a conversation when you are wearing them, if you pay attention and folks don't mumble.
I don't think I'll buy another pair. They're only $10, but they aren't that much better than the $2.00 plugs.