Mr Bill 2011 wrote:
got one on my Canon 70D and love it. It's great if you don't like to carry a bag full of lenses and change them in the field, but it does get heavy after a while. Keep in mind though, it's a zoom lens; if you are a pixel peeper, you won't like it.
I would imagine that the super discerning would not buy the lens to begin with. The majority of us would likely be unable to notice and real difference in quality and be quite pleased with it. Numerous posts and reviews have been quite positive in my opinion.
Personally I carry extra lenses even when hiking, but the convenience and quality of this lens has been quite suitable for many.