Cons:treble could be better, isolation annoys people who try to talk to you
The title explains it all almost...
These little phones partially because of the seal they make with your ear canal (and also because they are made by koss) have alot of bass
overall sound quality is good considering they are practically the only thing in this price range that can be classified as a canalphone... nothing that would make someone who wants to buy some more expensive canalphones change their mind but worthy of a purchase to hold you over until you can get some (if you are broke like me)
the treble does seem a little rolled off and maybe a little "tunnelly" but there are some cheap and easy mods that can be done to help with the "tunnelly" part and a little treble boost helps as well
overall for $15 you can't really go wrong if you need something to block out alot of noise (great for yard work)