Don't waste money on more expensive altertantives
After reading a ton of reviews, and listening to some testimonials from a few friends who had tried these and a few other types, I went with these.  I'm happy I didn't spend more on some of the other alternatives out there.  These worked great at the Detroit Music Festival for many hours of techno, and didn't make my ears sore after long periods of use.  No ringing afterwards like so many other nights.
Rating: 5 stars