What is your opinion of this product?
I've owned the same Behringer Headphone amp for 15 years now and it still works great. My favorite thing about this unit is that each of the four amps has its own aux input, allowing you to amplify 4 different mixes simultaneously from 1 unit. I normally don't approve of Behringer gear (because I've owned several other pieces of their gear which have broke down prematurely. This however, is a great value and does everything you need a headphone amp to do. You'll spend more than twice as much on any other comparable headphone amp.