Wireless Controller for GameCube

New from SuccessHK

http://www.yesasia.com/?/item_photo/item/GC-0148-L.jpg

Product Features of GameCube Wireless Controller for GameCube
Eight completely analog action buttons
Analog controller with vibration feedback
Requires 4XAAA batteries(Not included)
100%compatible with Wii & GameCube

Are there other third party wireless controllers like this? How does it perform?

I didn't know these controllers were compatible on Wii. Good :)