These work very well. Depending on the level of noise reduction you want, you can choose the buds that suit you. I use the foam ones for more protection and the plastic for normal levels. The amplification works great for hearing low sounds. Very happy with them thus far but do wish there was a better way to turn them off.

The adaptive noise reduction earplugs have made it possible for me to play music again. I have tinnitus and loud sounds set it off. These work exactly as described and make it possible for me to attend concerts and play! I was going to buy a second pair but they out of stock!

At first I was suspicious since it appears Etymotic got merged; it's been such an awesome company. These “ear plugs” (a crude term for these devices) are really great. The most comfortable silicon design yet, lightweight, unobtrusive. The sound quality is not quite perfect, but light years ahead of the passive ER20s I've used up to this point. I flew to Hollywood to see Dead & Co, and realized that spending this much to ensure really great sound was a no-brainer given how much I'd spent for the shows. It's so great to have unattenuated sound when the volume level is safe, so no taking them in and out to talk between songs. Totally happy with these. Even the leash is comfortable; I could just see one of these popping out during a show, never to be found again. I've added a small clip to attach to my shirt collar for extra security.

They seem to work well generally, they definitely reduce the overall level and I just came away from two 6 hour rehearsal sessions (not actually non-stop playing) without my ears feeling compressed. What I did find, however, was that they cut both bass and high treble, leaving more in the mid-range. There were some comments from the others about me having too much bottom end for certain keyboards sounds (e.g. piano, organ), but I just wasn't hearing it. This is probably fine for listening to other bands, but in a rehearsal situation it would make certain keyboard sounds stand out more / less than others, and make balancing my levels harder. I had to rely on knowing roughly where my foot usually is on volume pedals rather than just judging what I could actually hear. This is OK for tracks that have been played loads of times before, but if I was working on a new song I'd need to take the plugs out for accuracy. For info, I play keyboards in a 70s Genesis tribute, so there are a lot of different sounds being reproduced. I wore them with the flip switch in the 9dB 'high' mode, as that gave me a little more open high treble. It did, however, increase the low volume active boost, which led to some slightly disconcerting volume 'pumping' when the rest of the band shut up. This also meant that heard volumes were not so accurate. For these reasons, I probably won't wear them for the three shows we're doing next weekend, but we generally try and keep the on-stage volumes sensible, and it's only for 2 hours of music a night, so probably OK. I will absolutely wear them when going to see other bands, however! Three stars, because at the price I would have liked a flatter EQ, especially at low frequencies.

I said ok because they don't work for me in my situation. They do work as described. Good amount of db reduction. However the sound is thin, not much low end reproduction. That were it a me problem in that I play bass in a band and I can't hear myself. Mostly everybody else but me. With that, it doesn't sound bad just not right for my needs. I didn't see any reviews on this particular subject so I hope it will help someone looking into these for the same use.