I just got a Blueant Q2 and it is awesome paired with an iphone 4. The audio is loud and clear. It's voice controlled, meaning you can answer/ignore calls totally hands free. It can also make use of the iphone's voice control to make calls, play music and etc, which also works well. It supports the A2DP protocol for streaming audio. The caller ID speaks the name of the caller if they are in your contacts, otherwise you get the number. Check it out.