I've never used these. I stick to cheaper brands built on reputation, like AKG or Sennheiser. Funny story, really. Once, I made my own pair of wireless headphones. I did this by using both a wired pair and a wireless pair interchangeably. One time, I stood up very quickly without thinking; actually I thought I was wearing the wireless pair. I ended up ripping the cord clean out of the wired AKGs! Boy did I feel silly... I never said that my wireless creation actually worked!
These days I only buy headphones with standardized cords that can be easily changed, both because of my own stupidity and because the cord is usually the first thing to break. It was one of the deciding factors that made me choose the ANC9s over the Bose equivalents, which have a proprietary connector on the headphone end. That means I would end up paying $30 for a new cable, instead of $3.