use OpenDNS with caution, especially if you are on a dynamic IP.Well, the way I see it, if you use TubeHAX as the primary and OpenDNS as the secondary, when your Wii U attempts to connect to Nintendo's URL's and fails, then it switches to OpenDNS and gets them. So, unless there are sites you can't visit by using just TubeHAX, then only use TubeHAX.
Edit: I'm not an expert on this, but I'm just trying to help.