I had an Arai a few years ago, and liked it so much that I bought one for my wife. In the intervening years, though, Arai seems to have lost their interest in quality control. The Wife's Arai literally fell apart- the visor supports were flimsy, and fell off, the bottom trims fell off, and had to be epoxied on, and the liner had numerous defects. Last time I'll buy or even consider an Arai. Her next Helmet was a Shoei- far superior in quality and finish. She says it is much quieter too.
Note: I now wear a Scorpion EXO-700, which seems to be a copy of the Arai. Although you can SEE the difference in fit and finish on the helmet as compared to an Arai, it is a VERY nice alternative to the Arai for less than 1/3 the price.