Benefits off the top of my head:

1-Stopped walking into wall corners and stubbing my toes.
2-Realized that the increased balance made me not scared of hieghts anymore.
3-The full body coordination learned from Tai Chi has made me better at all sports.
4-Osteoarthritis pain and clunking in my hips went away.
5-Back pain from tank accident injury went away.
6-Liver problems in remission.
7-Lost 85lbs.
8-Met some of the best people in Tai Chi classes.

The last one is my favorite! The rest were mostly first and second year accomplishments. I am in my 18th year.