This is a great lens for the price. The IS is consistent and allows you to stop down a couple of times in many situations. It's widest aperture of f4 produces pleasing subject isolation and bokeh on full frame, but operates best and sharpest at f8 for me. The true strength here is the wide focal length range which means you rarely need to change lens in many situations. The AF is fast and accurate - but you need to know the strengths and weaknesses of the camera AF system to get the most out of it - check your manual, as certain AF features may not work as expected (eg. the lens is a 'group C' on usable AF points on the 5Dmk4, which doesn't include the dual cross type AF point.)
On full frame there is a little bit of barrel distortion at 24mm, but is easily corrected in camera RAW.