Pros: durable, lightweight, snug fit, comfortable straps, cool.
Cons: can't figure out what the "Brain Trust" knob does.
Choosing a mountain biking helmet pretty much comes down to a few important details... Weight, Durability, and Fit, and I give the Specialized Enduro Pro high marks in those three categories:
The Enduro Pro is lightweight, without feeling flimsy. It is constructed simply, molded from a single piece of styrofoam. There are 10 vents on the top, which allow heat to escape, as well 4 vents in the front which channel air so that it flows through and out the 4 vents in the rear.
A small visor clips on tightly to the front of the helmet.
After 2 rides, I find the Enduro Pro to be comfortable and to fit snugly without being too tight. A flexible plastic cage Specialized calls "Brain Trust" cradles the back of your skull and helps keep the helmet in the right position. With my previous helmet, I would frequently have to push it back into place.
I've noticed that the straps are arranged in a way that prevents them from twisting, a problem I had on my previous Bell helmet. The Enduro Pro's are also made from a softer grade of nylon -- they do not cut or otherwise abraise your face and neck, even after a long ride.
The Enduro Pro meets federal requirements for helmet safety. I've already endoed, so far my dome is safe and happy.
Price is reasonable. As of 03/17/02 it was on sale for $40 at specialized.com and is a GREAT value. It retails for twice that, but should probably still be worth it.
The only downside so far is the whole "Brain Trust" adjustment doesn't seem to do anything.
This little knob on the back underside of the helmet controls the pressure the plastic cage, but it doesn't seem to either create or relieve the snugness of the fit. However, I can see it making a difference if my head were bigger.