I bought one of these as a back-up helmet:
Sistema The good: it's very comfortable, weighs about 3oz less than a similarly sized Shoei Multitec, looks good, & is easy to operate. My Multitec is a size small; my Sistema is a size medium.
The bad: the visor isn't sealed very well at the top and induces wind noise. I think I might have a fix that will improve that. The sunshade has a bit of distortion.
The verdict: for $200, well worth the cost.