I use the Walker Razor Electronic Muffs when duck hunting, but I only duck hunt once or twice a year. Personally, I think they are extremely annoying, but I have already lost too much of my hearing.
I pheasant hunt ~25 days a year, and for that, I use the DefendEar Hunter Passive. I cannot stand the amplified steps on grass that the electronic versions seem to create, and I like these a lot since they are not electronic. I can hear most birds get up with them in, but my hearing is limited at times. For example, a bird cackled last week. I knew it cackled, but I couldn't tell how far away it was. An ear doctor "scanned" my ears and made these for me. They fit perfectly, and weren't terribly expensive (~$150 + FSA).