I tried the Sportear and it does work pretty well for some things. I HATED it for hunting though. It picked up and amplified every rustle, footstep, wind blowing, leaves, and so on, very very distracting. I mostly hunt Upland and spot/stalk big game, if you usually hunt out of a blind or tree stand or something where you're sitting still they might be fine but all the amplified background noise drove me nuts.
They do work though, when you fire they block the noise. Of course so does a $12 pair of ear muffs. I always wear ear protection at the range and never hunting but I probably should...