I've had issue after issue with my HTC One Developer edition for the last six months which have been a pain in the butt and wasted a ton of my time... First the camera started to malfunction, so I had that repaired locally (with another defective camera), the local guy who finally repaired the camera messed up the screen which had to be replaced, then the top speaker blew... I was seriously considering throwing the damn thing under a freight truck and get another phone.
I decided to give it one last chance, and send it to HTC for repair. They estimated the repair between $90 and $200 as my warranty was void (I was upfront and told them the phone was rooted, s-off, opened for repairs, etc.).
Exactly 1 week after I mailed my device to the US repair centre (from Canada), A guy from FedEx handed me a package with this:
They were supposed to call me with a quote for the repairs. I had two weeks remaining under warranty and they repaired it free of charge!
Sounds is so awesome with two speakers working! Love this thing!