I bought this lens recently, and the quality of the images is great...
great contrast, bokeh, saturation, sharpness... no real faults!
the focussing is quick and accurate
the IS (image stabilising) is great, and works well
however I have a few gripes!
1. the lens hood comes separately, which is the case with non-L lenses...
2. it feels lightweight... the 24-70L feels mich nicer in weight and build quality (the zoom ring is a little too light)
image quality gets 10/10
build quality gets 8/10
pricing gets 8/10
AF accuracy and speed gets 10/10
for APS-C cameras there is no other choice in this price range!