Have had the big Peltors for several years. When they do "blocK" it is everything, including conversation. I think it is maybe "Pro Ears" that are said reduce overall volume during close gunshots - without blocking out normal sounds. Others here can likely expand upon.
Got the bright idea of wearing them quail hunting one time, the theory being able to hear quail running better before they flushed. The crunching of leaves and twigs by my own footsteps was so magnified, it quickly drove me nuts and I had to remove.
Overall, I've been pleased with Peltors. Quite comfortable. Single nine volt battery lasts a long time (if ya remember to turn off!). I think the bigger ones are rated better for noise reduction. Seems like Cheaper Than Dirt offers them in catalog. Online too?