I purchased two of these about a month ago. I inherited a wii, and have been trying to avoid upgrading to wii plus remotes.Connects and calibrates well on both controllers we have (the original wii white ones). I've had almost no trouble with calibration, and have had no trouble with it reducing the functionality of the remotes.The only reason I can't give it a full 5 stars is because, as a few others have stated, they do tend to slip off easily. Even when locked, it happens from time to time. I've never had either slip off on a normal game, however I have lost the connection on both red steel (solo play) and wii fencing.Now, granted both the fencing with my girlfriend and red steel can get a bit over the top with shaking the controller, I still would prefer them to stay locked in. I cannot, however, remove more than one star because they work perfect for normal play, or if you don't button mash when fencing.Overall I'm very happy with this.