I don't know what happened with these other reviewers, but I had no problems with lag on this! I tried it with both an original SNES and original NES controller and played for an hour with each just to test it out. It did seem to take a few seconds to connect properly, but once it did, it responded perfectly fine. As in, I plugged in the controller and tried to start the game immediately, but took a few seconds for it to start responding. Though maybe you just need to have the controller plugged in before you even turn on the wii? Anyway, I didn't have any problems after that.Pros and cons: I appreciate the little orange light on the top of the adapter to let me know it is connected properly. My biggest concern with this is that the cable is really really short. It's easiest to have your Wii laying on its side so that the adapter can sit beside it. Good luck if you're short on shelf space. But overall, it works and doesn't cost much, so I would recommend it to others.