These bad boys were just $10 after rebate I found on spoofee.com, from newegg.com. Retail rate is about $50 - $90.
I've been on the look for a decent pair of headphones. While mowing the yard, it's tough to get a pair that stay where you put 'em, and block out the mower noise. I have been using some Pioneer headphones that came with their portable XM Radio: decent sound, but tended to fall out or loosen up with exercise. These Sennheiser headphones come with three different sizes of smooth ear inserts, so a perfect fit was easy to accomplish.
I worked in the yard today for about four hours, and sweat and all, they stayed in the whole time, without the need to figdet them back in occasionally (as my Pioneer earphones loosen up all the time... very annoying). The assymetric cord was about 6" longer than the Pioneer headphones, so there was less tugging/pulling of the cord while the MP3 player was in my front pocket. The CX300's stayed in my ear. Period.
They also sealed out the noise of the mower to a level that you would think there is active noise cancellation, but it's just the superior seal of the earphones. The mower noise was never a bother while jamming out. In fact, I could turn down the volume, as there was almost no mower noise to conceal. That will save my hearing and my batteries.
Sound was clear, bass VERY DEEP for headphones, and non-fatiguing. Fatigue is when you put in a pair of cheap headphones and you just get a headache, and the music never sounds "right"... you just want to rip them out of your head. Not these Sennheisers... NICE and HIGHLY GEEK RATED.