It's as light as many other helmets costing many times more. Reviews seem to be generally good, but people generally don't know anything. You could buy it and send it back if it doesn't fit you. I would at least try on some more expensive helmets in a proper shop beforehand to see what a good helmet fit might be.
I wouldn't buy a helmet without trying it on. Individual brands will have their own shape. You're head may not be that shape. Best to go and try them all on at a shop like Y's road that has a good range, then you can see what is most comfortable for you.
I would buy a brand helmet (my favorites are Giro and Specialized) that has good reviews for things like ventilation, actual (versus claimed) weight, ease of strap usage and cage adjustment, and take notes of comments on fit--some are more designed for oval circumferences, others for circular--then try a few on at several different LBSs. I wouldn't go real cheap on a helmet--it is something you will have for a long time, and if need be, could make a big difference in how you come out of a tumble.
I was planning to get a brand one, still when I found one that cheap I was wondering how much difference there would be on all the brands and models. And when I asked about protection efficiency I was expecting there was some crash test that would grade them. Seems that there isn't this kind of thing.