I wish I could say I've tried one, but can't. I took a look at them, good looking helmet, but for that price I'd look at Klim. The Klim modular is $649 retail, but if you contact them directly, a non current paint scheme will be about half price. The Klim's are very light as well, maybe about the 2 lb + range. The Klim also comes with a photo reactive face shield, so the internal sun shield isn't needed. One of the guys I ride with has one and loves it. The shield is clear in the dark or in cloudy conditions, but darkens instantly in bright light. The brighter the light, the darker she gets.
Good luck in your search, hopefully this gave you something to consider.