Steve O wrote a review of Leatt DBX 5.5 on May 28, 2014
Familiarity: I've put it through the wringer
I have been a fan of Leatt braces for years and have worn the DBX for as long as I can remember. The old design was excellent but I always had issues with the fit not being perfect. That has all changed with this one. The lower profile makes helmet clearance a non issue and the adjustments are much improved. My kid wouldn't wear the old style but he wont take this one off. He doesn't even know it is on him.
So do they work? I have had two friends crash head first while wearing Leatts and they both walked away with nothing more than a scratched helmet. So I would say yeah they work. Bottom line is buy one of these. There is no reason not to.