I won one of these in a competition along with the Xbox 360 battery packs.
after getting several uses out of it so far I have come to like it its a decent sized unit and has a good design to it. it charges well and is easy to place batteries onto it and get them charging really quickly.
one flaw i have found is that if i am to charge 2 batteries at once there are no individual LED status lights for each magnetic charging area, it will turn green when one of the batteries has charged and then will go back to red when that battery has been removed, but without knowing which battery has charged i do not know which to take off.
it is not a disaster but it seems as though it has not been though out that well.
Also if you are to charge only one battery this is not much of an issue.