The only issue I've had with this helmet is that the vents seem all-too-good at allowing insects in. Perhaps this is the case with all well-ventilated helmets. I've had to emergency-brake more than once to manually remove wasps, bees and dragonflies that have hit my bald head at 30-40 mph through the vents.
Other than the bug problem, the helmet functions fine. It has not (yet) been pavement tested so I cannot comment on how well it performs when it comes to its primary purpose.