I use the ufly/QC15 set up. works great. Sweet for riding in the back without carrying another music rig. I have a brand new in the box QC15 For the day the original craps out. The ear cushions last about two years, but are cheap and simple to replace. There is plenty of notice when the battery is running down. It has never failed, unlike the call center Telex the company provided. (cough cough kick back) Lithium battery life is about six weeks.