I just bought this with my 2004 1000RR, however it's a little too big, I think I would like to go with a medium. I had an Arai Quantam/F and an Arai RX7-Corsair before this helmet. It's more comfortable than the Corsair, and makes less noise.
Here's what Arai has to say :

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THE NEW QUANTUM-2
Arai's new Quantum-2 represents the most sweeping changes we've made to our best-selling helmet since the Quantum/f model was introduced in 2000. NINE MAJOR UPGRADES AND CHANGES to be exact. Now, most companies wouldn't touch their best seller. But Arai isn't most companies.

Outside, the new Quantum-2 has Arai's SCLC (SUPER COMPLEX LAMINATE CONSTRUCTION) SHELL, the same special lightweight shell formerly reserved for the RX-7 racing series, plus Arai's LATEST "ORGANIC" SHELL SHAPE, designed to be both more natural looking and to enhance the helmet's ability to cut through the wind more cleanly, thereby reducing buffeting and making it more "still" in turbulence than previous models.

The intake and exhaust VENTS ARE RECESSED INTO THE SHELL to improve airflow, reduce wind noise, and give the helmet a cleaner look. The new TD top-vent design has larger 10mm holes to move more air than the previous 7.8mm holes. The SLIM, SLEEK SAJ FACESHIELD SIDEPODS are the same ones used on the latest RX-7 Corsair model, as is Arai's PATENTED DUAL-PIVOT CHINVENT DESIGN whose easy-to-operate vent increases airflow capacity in two positions: the first position sends air directly to face; the second directs air to the shield for improved de-fogging. The new chinvent also features an ACTIVATED CARBON-COATED FOAM FILTER.

Inside, the new Quantum-2's main feature is its WASHABLE, FULLY-REMOVABLE LINER. It also has a REDESIGNED COMFORT LINER which Arai says "pays increased attention to comfort by repositioning and adding interior padding, providing a level of comfort that could previously only be found in a full, non-removable liner". New, REMOVABLE CHINSTRAP COVERS that allow dirty covers to be easily removed for cleaning and damaged covers to be replaced easily, and a NEW BREATHGUARD DESIGN also borrowed from the Corsair, complete the interior changes.
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MSRP is $497.95, I paid $356.96 without tax.

I have used this helmet for 550 miles exactly. There is ONE minor blemish on the helmet that I tried to take a picture of. I had to spend 5 minutes getting the right angle of light to hit it so it would pick up on the camera. I had my helmet on and I knicked it on the building wall going by it. There is NO structural damage at all, just the small cosmetic blemish pictured. There are NO other blemishes on the helmet, just the one circled in the 5th picture.












$280 is my price...e-mail me at immortal@ggleague.com, reply here, or PM me here.

 

good helmet its what they call there "relaxed" shell. so it fits a more "oval" headshape, very nice helmet and a very good price