Buy this lens if: - You want a general-purpose, medium-zoom lens for a non-entry-level DSLR. - You want high resolution at all focal lengths, along with reasonably good flatness of field. - You'd like effective built-in image stabilisation. - You'd like a lens that requires no readjustment when you fit polarisers and graduated filters.
Don't buy this lens if: - You need true macro capabilities. - You want a lens for a lighter camera body.