1st set cracked in the center of the headband after about a month.  Once the crack appears the headset starts to disconnect the wires at the crack and the headset stops working entirely.  2nd replacement set cracked after about two weeks.  That was over a year ago, I didn't bother replacing it because why bother.  Then I found out they were issuing a different design entirely as replacements (freepulse).  Don't bother with this design unless it's free.