Love my Shark RSI! The anti-fog visor never fogs. It's good quality, light, and fits my head like my old Arai. Plus, it's quieter, about $100 cheaper, and might be a touch lighter.
I hated screwing around with easily scratched inserts or short lived antifog treatments on my arai.
Had a Scorpion in the past. Good anti fog. Crappy quality overall.