Go For It! It's a great program! It's never to early to start, but there comes a time that it is to late to start, and you don't want to get there.
Checkout my before and after pics on my blog at www.XFitOnline.com
I started at 255lbs and 5'10" in Jan 2011. In 9 months, I went from a 40" waist to a 32" waist and 255lbs 41% body fat to 190 and 20% bodyfat. I've not done it in 6 months and put on about 7-8 pounds since. I'm starting back up again in about a week.