Clinton Fitch of the aptly named Clinton Fitch(dot)com is on a roll.  I think this is three reviews in three days for him (though he now claims to be all caught up which is more than I can say.)  In his latest review, he takes a quick look at the Just Mobile PK 06 Hands Free Car Kit.  With more and more states moving to a hands free while driving requirement, this could be an important review for many of you to read.  In his review, Clinton states:

From a call perspective, the PK-06 offers excellent call quality and clarity.  In my testing, I had no problem hearing calls or being heard on the device, even on roads that created road noise.  Part of this is the DSP (Digital Sound Processor) that is built into the PK-06.  This advanced feature cuts down on background noise for those you are speaking with through the device but also clarifies the sound coming to you as the listener.  The DSP normally increases costs dramatically so Mobis should be commended for including it while keeping the cost of the device under $100 (US).

Check out his full review at Clinton Fitch(dot)com.