To connect the controller to the Wii, you'll have to plug an adapter into one of the GameCube ports on top of the console. We suspect that won't be an issue with most of you, as we're certain you (like us) already have a few WaveBird adapters plugged in up there. And, to add even more appeal to the thing, it'll only retail for $19.99, the same cost as Nintendo's official solution.
We'll have to wait until the thing releases to see, but we're pretty sure that Nintendo's controller will end up winning in the end based on feel alone. That thing looks bulky.