Here's my very personal take on the lens. Not very technical - as I also ignored the rating for the more technical aspects.
This is my grab and go lens for my crop 60D. Usually the only lens I have along while traveling. Very versatile range ("equivalent" to 24 - 136 on a full frame) that covers most outdoors situations. The other main use are candid shots of outdoor parties, where you can switch fast between group shots and single portraits. Not perfect as the aperture is not exactly large enough to get perfect head shots - but for dynamic candid situations it is quite forgiving.
Picture quality is great for a zoom lens. There is substantial barrel distortion and vignetting on the wide end. Lightroom deals with that quite well. But besides a soft spot on the wide end it is amazing sharp.
There are better lenses for any specific given task. There are faster lenses, there are sharper lenses. But as an all-rounder lens it is really a great zoom lens - especially on a crop body.
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Its extremely versatile. 


