Pros: Great bass, dual drivers
Cons: A little bulky, not cheap
I upgraded from a pair of UM1s because they didn't deliver the bass I wanted. I used these while practicing the bass and listening to my iPOD. The dual drivers really deliver a high fidelity sound with hard to believe bass for the size. Warning: if you don't want to hear loud and clear bass that stands up in your ears, don't buy these headphones! or use an EQ.