I've got the Walker Razor electronic ear muffs, with 23dB NRR. And I often use the Walker foam ear plugs in addition, with 33dB NRR.
Pretty much everything fades to a whisper, if I use both. To hear others clearly (though faintly), I do need to crank up the electronic muffs to full volume, if I'm also using the ear plugs.
With just the muffs, I can dial in as much speech volume as I want. Essentially, just a little volume works great. I can be sitting next to someone at the bench who's shooting a .300 WinMag, but I'm fine. (In that situation, I'd prefer also having the plugs as well, but the muffs are okay.)
The sound with the muffs is clear and sharp, speech is crystal clear. But since it's a full muff that covers the entire ear area, it helps keep all the gun blast to a minimum.
Some years back, I used a relatively inexpensive set of Silencio muffs, which weren't electronic, and those were fine as well. Of course, if used with plugs in addition, it all but eliminated all the noise including nearly all speech. Too much reduction, a ~25dB Silencio non-electronic muff with ~33dB Walker plugs. The electronic helps (which my Walker Razor muffs have), because I can then dial-in as much clarity of speech while still keeping out as much of the gun blasts as possible.
