I've been playing with hi-fi since around 1970 - hopefully during the intervening period I've learned just a little about 'sound'. I've no particular respect for MP3 format, nor the players which are nevertheless a useful 'mobile' accessory - at the moment I'm using a Philips GoGear Vibe.
Sennheiser PX100s have been my headphone of choice for the last few years (cost vs performance) but recently I've had need of something not 'over the head' and tried my collection of in-ear phones again. Philips, Creative, Panasonic etc. etc. and all pretty disappointing. On a whim I bough the MX471s and, when I first tried them, thought not much different to all the others. Disappointing.
However, they come with one pair of rubber ear 'sleeves', 2 pairs of sponge covers and not a lot else. Fitting the rubber ones and getting a really snug fit in my ear made a world of difference and they stand head and shoulders above my other in-ear phones. Not quite up to the PX100s though.
The wires are thicker than normal and of a resonable length (1.2m); the earpieces , it says on the box, are "Ergonomic fit" & "Designed for smaller ears". I wasn't aware that my ears were anything other than average, but I did need the rubber sleeves to get a tight fit - seemingly responsible for a huge improvement in the sound.
The sound. Yes, reasonable base, controlled treble (maybe even a touch lacking. Maybe.) and overall musical, involving and 'stress-free' after say a couple of hours. At the price, very commendable.