205's are the bass version of sennheiser and they clamp your head and make that bass bump well. 202's are ****- and 2cord-sided -- which is the most noob a pair of cans can be--
also they have sucked out mids and are shrill sounding
I own both of 'em and even got the HD 439 ear pads. m50 > HD 449 any day. The HD 449 are easier on the head, though.