The lens does what ago, is processed very valuable, splashproof, the autofocus is fast, the two IS modes are great and do their job well. Even 1/60 sec at 300 mm are thus at my hand yet possible, but I also have a very steady hand, I must say. Autofocus and thus the communication between my EOS 70D and this telephoto work excellently. I have nothing to complain about. Only at low contrast and non-optimal light conditions gets the phase AF 70D my problems and get back no knack sharp photo. But for that it works with the Live View 100% well even in low light / contrast in the scene.
I am very pleased by the Bank. The lens is of course difficult, but what I find very good, yet compact and fits in any camera bag. Top! Furthermore, the L lens is as usual therefore with lens hood and protective bag. Also top. I am convinced of the purchase and am proud these L-lens can now call my own. Example photos follow.