Ever since I got my Wii U, I have been wondering how to use a GameCube controller when I want to play Super Smash Bros. That is my preferred controller, so you can imagine my disappointment when I realized there were no built-in GCN ports on the Wii U console. I was even more upset when I thought about the future Wii U installment of Super Smash Bros. Fortunately, I got this as a gift. It is the Total Console GC Adapter for Wii/Wii U, and it allows me to connect a GameCube controller to my Wii Remote.
Overall, I like the adapter, as it does what it claims. The only problems I noticed was how it did not seem to connect 100% every time. Sometimes, it would move the cursor around and start activating buttons I did not press. After a reconnect and a few seconds of patience, though, it was working fine.
Check out the quick video for a setup tutorial, explanation, and some further thoughts.
EDIT: I accidentally left out information about rumble. Since the GameCube controller is essentially functioning as a Classic Controller, and the connection cable does not carry power (to my knowledge), the GC controller does not have rumble. This is something I have not thought about in a while, since I’m use to using a WaveBird wireless GC controller, which also has no rumble.