I originally purchased this lens as my first zoom for my first DSLR. Main reason I gave it up was to step up to L glass. However, financial concerns caused me to have to sell the L. Recently purchased this lens again in the newer Di format. Not much has changed, at least from my limited exposure to the newer product, from the older lens.
However, for the money, both lenses have performed more than admirably. Definitely use the included lens hood for long zoom pictures or light intrusion will be a problem. Keeping the lens down to less than 250mm will keep the issues at bay.
All in all, considering this lens is 1/3 the price of the Canon 70-200mm F/4L that I had before, this is an excellent value and will do really well for anyone on a budget. Highly recommended for the price range.