Your chance of falling increase to a 100% gauruntee. From a 1 out of every 10 runs. At least when speaking about dh. The traction has a bad habit of going away and you ride by the seat of your pants. Its fun, but you would want something.

I should say this was done on a dh trail, I am not talking about xc or even fr (highways with jumps)...this trail, especially, in the rain would have sucked, slick enough dry and dusty in the wet, its downright dangerous