Died after 7 Months,
This review is from: Sennheiser MM50iP Stereo Headset with integrated microphone - tailormade for the iPhone - Black (Electronics)
Well, for seven months I was happy with these headphones, the mic is good and the sound quality of the ear canal headphones is exactly what you would expect from Sennheiser.
I 'upgraded' from a pair of CX300's to the MM50iP's and the audio quality was exactly the same - from this point of view the product should have 5 stars, however after only 7 months of usage (and it was careful usage too) I lost the sound in the left ear. All was not lost however as these do come with a 2 year warranty. Amazon were good enough to refund me and rather than replace with more of the same I decided to spend a little more money and get the more expensive 'big brother' which is the Sennheiser MM70 iPhone Headset with Smart Remote and Mic to Control iPhone, which I have also reviewed (and they get the full 5 stars).
So, dear reader - spend a bit more money and buy the MM70iP's instead, you will not regret it at all.