Summary: First off, the only reason I rated 4 instead of 5 stars is because I had switch out the Sennheiser bud tips for my old Sony MDR-EX71s. The Sennheiser tips created an uncomfortable suction inside my ear canal.
Sound is awesome. I'd equate the bass to having a subwoofer in your mouth..
Summary: Just gone through reviews for the Sennheiser 'phones. Many folk seem to have problems fitting them. I too seem to have tiny ear canals and ordinary earphones were painful and kept dropping out. I have the Creative version(v.good).
Summary: I already owned a pair of these and came to the reviews to see if others' disappointment was similar to my own. Reading no end of reviews I learnt a lot, first I thought that perhaps I'd bought counterfeits or that as others had mentioned the much lauded "bass-driven sound" was a con.
Summary: Lost one channel of my Sony In-Ear 'phones after many years of service so I decided to get these. I am not disappointed. Good bass yet clear as a bell. Good seperation too. I am used to in-ear 'phones and know that bass is dependant on how deep they go in your ear.
Summary: Tempted by the 99p price available on a certain other online marketplace website? Don't be. Think you might find that the Hong Kong version isn't entirely comparable to what you'll pick up here.
Summary: I've been turning to Sennheiser since I bought my first iPod in 2005 to replace the awful earphones which Apple churn out. I have to say I've been very impressed with these considering the price.