It looks good to me, but I don't know that I would like to have a conversation where everyone can hear what you're talking about. I would go for the ear piece because you can use it anywhere. It's a lot cheaper than the car unit. Check www.sharperimage.com they have cool car units. Like ViperX said I just went and got a second earpiece the other day from AT&T Wireless totally free.
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So much to do, so little money.