The accessory is definatly an improvement on the standard controller itself. It allows more accuracy, especially in tennis, as I have GST and a top spin tennis which is not motion plus compatible. Overall, it seems there is an improvement, but I don't think its justified with GST. However, as new games come out, i'm sure it will be a definatly needed add on to improve the fun on the wii!Get more detail about Wii Motion Plus Accessory (Wii).
