What exactly do you want to know. I own an Arai Quantum/f and i absolutely love it. Comfortable and light. Wind gets a little noisy, but I wear plugs whenever I am riding for any period of time. Don't know if they ever pulled them from online sites or not. I got mine from Helmetharbor.com. Great folks to deal with and they give you an upfront price which includes everything (also the cheapest I found). Good luck.