Excerpt: I use this lens all the time as a shoot on opportunity lens. I initially had the focusing problems that others have described but whether it was the Sony NEX-7 upgrade or just the user and the camera getting it right it is now a fast focusing lens in all but very poor light.
Pros: Consistent Output, Durable, Easily Interchangeable, Fast / accurate auto-focus, Lightweight, Nice Bokeh, Rugged, Strong Construction
Excerpt: I got the lense so I had a good all range lense for when I am out with family and this lense did not dissapoint. The camera can take a little while to focus in low light scenarios but is very accurate in well lit scenarios, such as daylight.
Pros: Consistent Output, Easily Interchangeable, Lightweight, Nice Bokeh, Strong Construction
Excerpt: Well built. Smooth rings. Quick and accurate focus. Good image quality. Ready for EOS-M 3. I would recommend for all arround zoom lens for travels. I wish I could buy a constant F4 for that range.
Pros: Consistent Output, Good Image quality, Quick And Accurate Focus, Smooth Rings, Well built
Excerpt: I've only had the lens a week or so but am very impressed with the quality of the shots I am getting from it over its whole range 18mm-200mm. I originally wanted a 55mm-200mm but was disappointed in the Canon design (plastic bayonet mount, so so reviews) which is not available in the US anyway.
Pros: Durable, Easily Interchangeable, Fast / accurate auto-focus, Lightweight, Rugged
Summary: I have an NEX-5N and -6 and am considering this lens. But only 4 stars here for the price. It seems the identical lens is available on Amazon for about 120 bucks less. (I'm on mobile and can't add a link, but search for this same item at 590 dollars. It ships from Japan.) Edit: I just ordered it.