IMHO Arai helmets are the best you can buy
I have had a variety of helmets over the years including an Arai Quantum F, Shoei xr900, Shoei Intercepter, Shoei Z-One - all of which were excellent. The Quantum F and Shoei Z-One were involved in RTA's and both did their job perfectly, especially the Arai Quantum F where I crashed at 70 mph on the Nurburgring (that's another Story)
I have also have a Roof Daytona (my Spare) and I once made the mistake of buying a Caberg Flip which was rubbish
My current Helmet is an Arai Chaser - this is a brilliant helmet - reasonably quiet and supremely comfortable.
I don't think Arai make any poor helmets so I reckon its down to fit and price whether you buy it or not IMO
Lee