I own a Scorpion EXO 400. I also own a KBC VR-1 and a Shoei RF900. The EXO is the least expensive helmet, but has the nicest features and best fit/finish.
The Scorpion fits well, the vents work and the finish is very good. The lining is fully removable for easy hand washing, and yes, the anti-fog treatment on the inside of the visor works just as designed. Neither the Shoei RF900 or KBC have fully removable liners or anti-fog shields.....
I wear "noise attenuation devices" (read: ear plugs) 90% of the time, so excessive wind noise is not a major concern of mine, though I would say the Scorpion is a bit noisier than my KBC and Shoei.
I attribute the extra noise to the design of the faceshield attachments. On the Shoei and KBC, the faceshield is flush with the side of the helmet, the shield has no mounting holes. The Scorpion's faceshield has round openings that lock onto the quick-release mounts on the side of the helmet. It's a solid design, but I believe it adds to the wind noise.
My EXO 400 is very stable at speed. I have a Rifle windscreen, with tuning block. With the shield in the lowest position and at speeds up to 120 mph, I've experienced no helmet buffeting, even when turning my head side-to-side. I'm 5' 8" tall, if that helps at all. Also, the faceshield has never "lifted" open at speed (something an HJC I once owned did regularly).
I always recommend trying helmets on before buying. Spend some time in the store, wear the helmet for a bit. The dealer I purchased the EXO 400 from offered me 10% off (I've spent a good bit of cabbage there this past year) and that put the price within $10 of the best price I could find on the Internet.
The only thing about the helmet I don't like is the limited amount of "open positions" for the shield. The lowest position is about 1/2" too open and allows a bit too much wind to reach my eyes. Not a deal-breaker though, that's what the windshield is for.......
Ride Safe!