Got this for my Wii station a while back and has not given me any problems as of yet.
The actual station plugs directly into the back of the Wii where the power socket normally goes, and the power socket into the back of that. This means that it will protrude a bit further than usuall which can be a problem if it's usually against a wall.
Only other thing is that you will have to make sure that your Wiimote is syncronized with you Wii before installing the rechargable batteries as you won't be able to press the button inside with it there.
Otherwise a great buy.