Excerpt: This is a good all-purpose lens with a large zoom range. Focus is fast and silent which is great for video work. Only negative comment is that the lens produces some chromatic aberration (purple fringing) especially in the corners at the wide end of the zoom.
Pros: Easily Interchangeable, Fast / accurate auto-focus, Nice Bokeh
Summary: We have the 18-55 lens and the 55-250 lens and got tired of constantly carrying/changing them. This lens solves that problem. Photo quality seems to be just as good as the other two. You could maybe argue that it doesn't handle very low light quite as well (maybe one f-stop less?
Summary: I previously had an EFS 18 - 105 that was damaged during a fall, and bought this as a replacement. It has slightly better optics than my previous lens, and the extended range has been a real plus.