not! 3rd ride and broke my XX1 derailleur. Just about makes me sick.
I broke my XT rear derailleur, dropout and needed to build a new rear wheel after my third ride on my new bike. A guy I know broke his Dura-Ace rear der. and wheel during his first ride on his new bike riding on a paved bike path!
Don't buy anything you can't afford to replace.
Bummer; what did you hit?
I hit a stick along the trail, something that could have happened a hundred times with no problems, but not this time!
Guess how I destroyed my rear derailleur and wheel? A stick got stuck.
Guess how the roadie broke his bike. A stick got stuck.
Watch out for sticks!
Oh and mud, mud broke my other bike's derailleur.