If you are looking for another controller for your Gamecube, look no further. The Wavebird is the best controller, in the world, ever. It melts into your hand just like the standard pad and once playing you will wonder why the hell control pads ever had wires in the first place. No more pulling your console off the shelf in the heat of the moment, no more deaths when you accidentally pull the controller out of the socket and no more spending ages untangling four wires simply to start playing. I would not be surprised if wireless control pads become the industry standard next time round, they really are that good.
The Wavebird has the same level of precision analogue control on the C-stick, control stick and shoulder buttons as its wired bretheren, and as previous reviewers have noted there is no lag between pressing a button and the action being executed onscreen. Battery life is absolutely outstanding - I have been playing with my Wavebird imported from Canada since June quite heavily, and I am still on the first pair of AA's! (included in the box incidentally, how generous of Nintendo) It even works through doors, walls, people, cats, dogs, duvets, take your pick the Wavebird will transmit through it, and at much more than the stated 20-30 feet. There's no rumble, but quite frankly who cares? It saves on the batteries and since the Wavebird can transmit only and the reciever which plugs into a Gamecube controller port can only recieve, it would not be possible to add rumble as the signal is one-way only.
A worthy purchase indeed.