I have had a couple of crashes with it on and hit my helmet on the ground heavily and I am still wondering if I would have broken my neck, or would I have been able to tuck and roll better with out it on and not hit my head at all.
They tend to limit how much you can” tuck” in a crash and your ability to look over your shoulder (A bugger if you are leading a ride or if you are on the main roads with other traffic). Because it sticks out from the back of your helmet, the brace also makes it hard to duck under vines,branches and the like,so you have to take that into consideration if you predominately ride trails as opposed to MX. For MX they are great,as for trail riding.the jury is still out.
I believe they are a good thing, as all safety gear is, but not something I recommend you buy over the internet. You really need to try a few different braces on, is the general consensus.
