Highly recommended! They're a lifesaver.... or actually EARsaver!
I've used them at two concerts now and they work great! You still get to hear the music happening but it cuts down a lot of the damaging crazy loud noise that can cause ringing in your ears afterwards. And don't worry about it drownding out the music, I first thought it might not cancel out enough noise but both times after the concert was over my ears felt fine and I didn't have any ringing or discomfort at all.
Rating: 5 stars