I had this helmet for a year and a half and was recently in a very bad crash. My hit slammed against the pavement hard. I was moving forward in a group going about 22 mph and I went down hard enough that my Zipp handlebars broke! The helmet absorbed the impact of my head and I didn't have as much as a headache.
I will be purchasing the helmet again, but not just for safety. From what I understand, the safety features are similar in most helmets sold because of federal regulation.
The helmet is incredibly light and comfortable. It's cool and the most easily adjusted helmet I've found. Super easy to adjust from no headgear to something for cold weather.
Another review suggested that it felt cheap and the buckles never held. I can say, for a fact, that mine held without issues when being slammed to the ground with enough impact that my Zipp handlebars broke.