I have an old set of Peltor Tactical 6S muffs. They work well, but here's the things I don't like about them:
1. They're thick at the bottom, right where you need them to be thin to shoot a long gun.
2. They have a separate volume control for each ear. It's one more thing to mess with and the knobs are easily bumped.
3. You have to remove the ear cushions (both of them) to replace the batteries. The ear cushions are not particularly durable, so I always felt like I was going to damage them.
4. Batteries don't last long, at least for me.
5. The ear cushions get hard over time and crack. Likewise, the foam microphone covers fall apart. Both can be replaced, but you will spend almost as much for the replacements as a new set of muffs.
Several years ago I bought a set of the Howard Leight Impact Sport muffs.
1. They are much slimmer and proved less (not none, but less) interference when shooting a long gun.
2. One volume control works for both ears. Also has an aux input, but I've never used it.
3. Batteries are much easier to change. They are under a door on one side only.
4. Batteries last much longer, for me.
5. So far, no sign of anything wearing out on these muffs.
The Howard Leights have a slightly better NRR (22dB vs. 20 dB).
I also have several sets of
Caldwell muffs to share with others, mostly family. They are not as slim at the bottom as the Howard Leights, but they're not too bad with a long gun. The only thing I don't care for is how long they take to resume functioning after the cutoff has been activated. Both the Peltor and Leight muffs resume operation with no perceivable lag. The Caldwells take a fraction of a second to resume, which is a bit annoying. Maybe the others have spoiled me.