Nexxus Car charger opinions

Anyone used one of these?

play.com/Mobiles/Mobile/4-/12920338/Nexxus-2-in-1-Car-Charger-For-Blackberry-Mobile-Phone/Product.html#

Want to know if they work OK/are any good.

Need one to charge 2 8520's

Thanks.

if you are near a verizon store, they sell basically the same thing