I tried the Voyager 510, and could not get it to lay against my face, it kept pointing away from me. I also didn't find using it that good.
I ended up trying (along with a LOT of other bt headsets) the Plantronics Explorer 340
GREAT headset! Excellent sound, battery last me days, and one of the models comes with a car charger and storage clip (clips on to your air conditioning vent)
I really spent quite a while trying out numerous headphones, including the more expensive Plantroics. They either had incoming/outgoing sound problems, or wouldn't stay in my ear, or felt VERY uncomfortable... this one really had the best sound quality, and is really comfortable to wear.
Being it comes with a car charger, and I use it almost exclusively when I'm in the car, it basically stays in the car. No need to take it out, as I can charge it from my car.
(There are two versions, with the same headset... one comes with an A/C charger and (I believe) usb charger, the other model comes with car charger and holder.
Might be worth your checking out.