Having owned my Sennheiser PMX 680 headphones for 18 months and using them everday for running i was devastated when the left earphone stopped working. I then realised that Sennheiser products carry a 2 year warranty so i sent them off for repair. Today a package arrived from Sennheiser and i open it up to find they have sent me the latest model which is the PMX 685i. Whether of not they are brand new or refurbed i can't tell but i'm a happy customer. Has anyone had a good or bad experience with Sennheiser?