Hello,
I have been using it for the past 18months with a reasonable amount of success, although I have used it as a tool rather than a treatment, as I don't believe that the software available at the moment and the lack of research really justifies depending on its success.
I have put the information that I have uploaded some info on the internet, based on my own experience and the experience of the team I work within. The website is Wiihabilitation for Therapy and covers the main reasons why we are using the Wii and a break down of the games that we have been using.
Hope its of some help,
Regards