I recieved a pair of these (well three actually, since it comes with a free earplug) for Christmas, and having now gigged with them, I can safely say that they really are great. It takes some getting used to (I was speaking quite quietly for a long time, much to the amusement of my bandmates) since you sound a lot louder to yourself when compared to everything else (I play the trumpet - if you are a guitarist, you may have a problem hearing your own amp over the other instruments, as it cuts out those middle frequencies very well). They are very comfortable (I haven't yet tried to adjust them, but apparently that can be done if you're handy with a knife) and much better than my previous pair of similarly styled earplugs. There is a noticeable difference between the three levels of protection, I have settled with the middle one. My ears are much happier now, and I strongly recommend these over the competition.