Congrats! I've been taking martial arts for over 8 years, but I keep having kids and surgeries, so I've never been able to get my black belt (I have ANOTHER surgery next month... ).
DS has been taking martial arts for almost 2 years, and DD will be starting next year. I think it's a great activity for kids. I hope your son sticks with it. It will be great for him as he gets older.