I have been waiting for this since it came out and after using it for about two weeks, I am keeping it but with reservations. Here are my pros and cons:Pros:-This is the first of the stereo bluetooth products that don't make you look like princess leah -- it is fairly discreet except for the flashing status light at the bottom center of back pod.-Connects to my t-mobile dash and computer very well. I use it primarily on my 45 minute train commute and it does not cut out at all and the audio is very good in the train. A pleasant surprise is that I am able to have a clear conversation on phone calls on the train (mindfull of the other passengers, of course).-Very convenient not having to go back and forth between mp3 player and phone when getting a call. Also, no wires to tangle from my old earbuds are a big plus.Cons:-Not very comfortable for people with big heads. My head is fairly large and it takes some fiddling to find "the spot" but once there, no problem until you move it. It works for my purposes since I wear it less than 60 minutes at a time.-I also warn people with a lot of volume of hair in the back of the head or people who wear high collar jackets because it may tend to pull when you move.-One of the biggest annoyances with the s9 is that it is bulky. It feels solid and robust enough but it is bulky to store when you are not using it. It needs a hinge so that it can collapse to a manageable size. This alone would make me drop this another half star to 3 and 1/2.-Paired with everything so far (phones, computer) except for Jensen BT Adapter. May be operator error but I can't figure it out.I have not tested the battery strength -- I use five days a week for two hours a day and charge it about twice a week and have no problems.Bottom line is it could be better but right now, it's the best stereo bluetooth headphones out there.Cheers.