I've posted on this before but at the encouragement of forum member Alantoo and his reviews of the Peltor/3M LEP-100s I decided to give them a try as I was looking for hearing protection to use with the shotgun, I'm new to shotgun shooting.
They use foam or flanged ear tips rather than being of the custom molded variety and I view that as an advantage as, apart from anything else, performance in terms of noise reduction will always be better with foam as it expands to fill all the voids whereas the solid molded type can't do that. However, the evidence is that hearing protection is most often worn, and so works best, when it is comfortable so comfort should be the key even over noise reduction and molded does suit some people. Other companies do similar "in ear" protection with foam tips but I ruled one in particular out on the basis of a very bad reputation for reliability and customer service and the other on the basis that they didn't quite do something to match my requirements.
The LEP-100s aren't cheap and their price is on a par with the molded options. I wear them, mostly, for shotgun shooting which means a few clays and a few crows but I'd also wear them if zeroing the rifle but as the rifle is moderated I don't wear them when stalking. I depend on my hearing for my job and this also means I've more than a passing interest in the subject.
The short answer is that I've been very pleased with the LEP-100s. I knew from the start that the flanged ear tips wouldn't work for me and I was also aware that it is often necessary to mess about a bit to get foam ear tips that fit and are comfortable so it took me a little while to settle on an ear tip solution, I would suggest that anyone else buying hearing protection bears this in mind as it is very unlikely that the first thing you try or the stuff that comes in the box will be perfect for you. They offer good comfort and very high levels of attenuation and despite some reservations the recharging solution has grown on me and I now think it is a good idea. The LEP-100s have an internal rechargable battery (good for about 16 hours) and their carry case acts as a charging station that will run off either USB or 3 AAA batteries. You simply pop the ear defenders back into the box and they recharge and are ready for use the next time you are out. This does mean that they require time to recharge whereas a simple battery change can have you up and running with some other models but with the very long run time and the ease of having recharging take place in a small box which I keep in the car I've been won over to the way the LEP-100s do it. The sound quality with them is perfectly acceptable, they produce a little bit of hiss from the circuit but to be honest I don't find it annoying, and I can locate the direction of sounds quite well with them. I believe some people were unhappy with the wind noise as if you stick a microphone out in the wind then you are always going to get wind noise but to be honest I don't find it too annoying, yes there is some and yes if you'd nothing else to do in your life but complain about stuff then you could make a big deal of it but to me it sounds like the designers have done a reasonable job with wind noise and I'd put it down as being well worth the minor inconvenience.
In terms of my perceptions then I think they are, as is the case with all electronic in ear protection, expensive but having worn them for maybe 6 months now I've concluded that they offer good value as I always wear them when out with the shotgun and so I'm always protected. The only down side that I can think of is the requirement to test a few ear tips to get one you like and that fits you well but this is the same with nearly anything you'll buy.