Oh it will be amazing. I am quite the enthusiastic convert now. There is something about the physical challenge of the obstacles and the sheer adrenalin rush that really gets you in. I even stopped riding my roadie for a little while because I thougth it was boring!

Thankfully I'm over that now and have things back in proper perspective (you know - you should love all your children, even if for different reasons!) There was a great thread a while ago about why people who rode both roadies and mtbs liked them both. It really put it in perspective.