The bottom line is that I loved these headphones.  They were my first set of decent of headphones following my growing hatred of the apple earbuds.  They were also easily powered by my iPod touch 2G.  I recommend them.

Where to start?  I bought these in-ear headphones from Best Buy a while back.  They lasted me around 3 hours of total time out of the box before the left earphone began to produce crackled sounds and static.  I take incredibly good care of my belongings and my Apple In-Ear Headphones are still working fine after nearly 2 years of continuous use as my primary set of in-ears.  They did isolate sound a bit, but nothing about them made me want to continue using them.  Needless to say I returned them the next day.  Never before have I ever seen a headphone of such poor quality.