A lot of hater reviews, but really an excellent lens for the price.
Zachary Miller, Amazon
4 March 2015
Summary: An amazing lens despite the haters. It's true it's not the sharpest L lens, but it's still an L lens and a lot sharper and stronger than a lot of non-L lenses in the standard zoom "walk around lens" category. The sharpness is not the only factor. The 24-105 f/4L is only slightly sharper than the middle of the range(around 50mm) of this lens in certain situations and settings.
Summary: This is really a great lens. The overall sharpness and build quality that can be expected from an L lens. The macro feature is especially helpful because you dont have to carry a separate lens for macro shooting.
Summary: Great versatile lens. This lens is great if you need a mid range zoom with some macro capability. The macro feature on this lens is better than most zoom lens that purport to have a macro ability. It is not as good as a true macro, reaching only 0.7 magnification, but it is a nice feature to be able to have without switching to a true macro lens. The macro feature allows (and requires) you to get very close to your subject, within inches.