The Jabra BT8010 headset has some really useful features. The LED display, which can show caller ID info, and the vibrate function are very useful. I haven't actually tried the device in stereo mode yet, as I don't have a phone that can play music.The battery life is outstanding compared to other headsets I have used. I recharge my phone 2-3 times for every time I charge this device. Also, the battery indicator is the most useful of any rechargeable device I've ever used. Whereas most seem to show 100%, then very quickly they drop to 0%, this one gradually progress from 100% to 0% as the battery drains.When used as a Bluetooth phone headset, the sound quality is average to above average, for both the you and the person to whom you are talking. I like the auto-volume leveling feature in principle, but since I'm usually at the loudest volume, in a noisy environment, it is already pegged.My biggest complaint about this unit is the way it fits, or rather doesn't fit in my ear. Even though I have rather large ear canals, with this device, I have two options, neither or which are acceptable. First, I can jam it in my ear, which is very painful and I can tolerate for only 5-10 minutes. Second, it hangs precariously off my ear, and will fall with even a gentle head turn. Whose ear did they design this for, Bigfoot's? If not for this unforgivable flaw, I would love this headset.