So, I am in the process of deciding which lenses to purchase (Sigma 10-20mm being one of them) in the near furture and I came across the Tamron 18-270mm lens. I immediately googled and found bunch of reviews on it. Most of them praised the lens for its abilities. But I need reviews from people with experience. This lense would be used for general photography. So whats the verdict on this lens? Any help is appreciated.