Pros: tons of bass
Cons: Too much bass? Unsatisfying highs.
Quite nice if you like/need bass. Lots of it.
This phone is a weird construction that falls somewhat short of what it could be. If only UE had refined the bass performance, done something about the highs and added some midrange.
At any rate, theres bass aplenty if that is what you are looking for. Bass extends deep and punches hard. I often find myself EQing the bass down and still i find it somewhat too much.
It has highs, but it often gets drowned out by the amount of bass in this phone. Same goes for midrange.