I brought this product based on the ratings that it had received from other customers.
Pros: The sound is awesome, probably the best iPhone earphones for the money you can get!! Play.com also have a 2 year warranty which is excellent because if you're like me you will certainly need to use this.
Neg: This is my 2nd pair of the MM50s and the same fault has occurred in this pair so I now assume it's a design fault. The problem is if you're into outdoor activities such as running, gym, or just general wear and tear you can expect these products to last maximum about 8 weeks. The wiring in the jack is extremely shoddy which isn't unknown to Sennheiser products.