I had issues with the pair I received from Massdrop. They were very responsive and helpful. Eventually, I ended up with the actual pair shown in the pictures here, since they didn't have any others in stock at the time.
As for the warranty, I'm not sure how strict Philips would be. Maybe someone from Massdrop could chime in, but I wouldn't let that sway you away from these. For the money, you'd be hard pressed to get a better pair of...