Believe me, i don't usually make (actually never) threads talking about customer service but I just felt like I had to make one. I am also not the person to usually mail in broken products still covered under warranty to companies because I am very skeptical, having read a lot of horror stories.
However, the day came when I had a nagging problem with my Sennheiser IE8's (exposed wire) and really wanted them repaired because, yes, I loved them too much. I read a few posts talking about Sennheiser's repair service and how good it was. So I took a leap of faith and mailed them in, the earphones reached the service centre (in Old Lyme, CT) on wednesday (evening). I got a ship confirmation e-mail the following monday, and the earphones are in front of me right now (total time - 5 business days INCLUDING delivery). A brand NEW pair. Not only was the roundabout time exceptional, but this is top notch service. I will definitely be doing business with them again!
Sorry, I was so amazed that such service standards still exist that I had to post this thread!