I've seen all the negative reviews about the S9, and I have to wonder if I've just gotten lucky. I've had mine for about 9 months now, and I really like it quite a bit! I wear it for jogging, and it does quite well. The fit is fine, and until you wear one, you'd think it would be uncomfortable, but it's not. The sound quality is quite good too. I use mine with two devices: an HTC FUZE phone (from AT&T;) and Sony TMR-BT8iP Bluetooth adapter for iPod. Both work equally well. One thing I like about the S9 is its ability to connect to multiple devices, so I can move back and forth between the iPod+Sony setup and my phone.One thing to be aware of is the S9 will automatically establish a Bluetooth stereo connection with the last stereo device used. So when switching from my iPod back to the phone, I have to go into the phone's Bluetooth setup and tell it explicitly to use Bluetooth stereo with the S9. That switches the S9's stereo settings back to the phone, and it will subsequently reconnect to the phone with the BT stereo profile.The only problem I have with the S9 seems to be control-related. It's quite common for me to have to press the S9's Play/Pause buttons several times to get music to start playing, even when it's actively paired with the phone or iPod. Once it gets going, I have no further control issues.