i think m is the least roll off and s is the most. i got my 421 on ebay, so it didn't come with a manual and i could be wrong.
what's with people driving up the price of 421's on ebay? i bought my first one for 200 bucks and i fully expect to pay that much or less on the next one. about 2 montsh ago they were only going for 200'ish. they only sell for 330 bucks new and you can get factory b stock direct from sennheiser for 270 bucks.......i see people buying them used for 250-300 bucks quite often lately.
everyone just needs to quite bidding on them and let me buy a few for 200 a piece and then they can start driving them back up.