Only 1 person has the s1's at work so far but loves them, still early days however. There was a group buy of the a20's and there have been more than a few breaking within the first months. Some have already sent them back multiple times, while Bose have been very good about quick repairs and no claim resistance, it's a poor standard for a $1300 headset. Considering you get more and they cost less the s1's would be my pick.