I want to buy it. Anyone have good or bad experiences? It's either that or the Canon 70-200mm F4, but I'd rather have an F2.8, but the Canon version is twice as expensive as the Sigma version. Another question...if you were to choose between a Canon 10-22mm Wide Angle Lens and the Sigma 70-200mm lens, and all you had was the kit lens and a 50mm lens, what would you choose? Although the 10-22mm creates a lot of cool/unique photos, im leaning towards the Sigma 70-200mm because it seems i might get more use out of it... Thanks!