I've had one for 2 years and it's the best helmet I've worn. The best aspect is the amount of peripheral vision you get. I imagine that's the same as other helmets of this type as well. Light, well made and... well... what Zander said! It's a good price too for such a light helmet.
Apparently the visors are expensive, but I haven't needed one. The only thing that's bad is the ratchet on the visor, it's very weak and it's impossible to keep open on the first notch.
I'm a Shoei man and they do a similar helmet now so I'll try one of those next, especially if it has the pin lock anti mist in it.