Have a ProTec multi-impact and this guy. Was concerned, like Mitch G, about the no ratings. However, I did a bunch of research about the ratings - which are antiquated, and were developed in 1970's & 80's - and then I contacted Bern, and talked with them regarding the Hard Hat and the concept behind it. It is made from Brock foam - same stuff in NFL and NHL helmets and pads - and is designed to take multiple impacts and not split like a traditional helmet.
I ski primarily backcountry in CO and WA, race, and throw in a little park time for color, with 50+ days in the hard hat, and have confidently made the switch. I'll even be taking out the knit liner and using it for mtn biking this spring.
This is a very light-weight, sturdy, warm, well vented, and comfortable helmet.
The boys in Deluxebury, MA did an awesome job with this unit!