I have only ridden with an Arain helmet (besides my 1st helmet being a HJC that I didnt use for to long). Currently have an Arai Vector and Arai RX-Q. Like the fit, padding, venting capabilities and peripherial vision. My head shape is a Intermediate Oval. Some of the padding (cheek and headliner)can be peeled off for a custom fit. Most the the Arai helmets also have a chin spoiler that helps keep some of the air out of the helmet when moving, which is really nice during the colder season.
Have rode in the Arai Corsair V and by far that is the most comfortable helmet I have used. The adjustable wing on the back of the helmet makes a big difference in keeping the helmet stable at speed. It was also the noisiest helmet of the Arai's i've used, but only so because of the amount of air that it flows.
Hope this helps.