Worth the money if you go to a lot of shows.
You know, I didn't expect miracles, but this is way better than the big orange things I used to get at Walgreens.  I wore them to see Flaming Lips at Bill Graham in SF on Halloween.  At first I though they didn't do much, but my ears were not ringing after the show, so they must have done something.  My major complaint? They're hard to hold onto, which means they're easy to drop and lose forever in a crowded show.  The canister is nice.
Rating: 4 stars