Overall, this is a fantastic lens suited for many purposes. If you have ample space, it makes for flattering head/torso shots, it is a good FL for flower portraits or - when coupled with a 1.4x extender or extension tubes - is a capable close-up lens choice.
Tight accent landscapes are similarly harvested well with this gem.
It is FAR lighter and sharper than the f/2.8L 70-200 flavors...so light that I routinely get sharp photos handheld at 1/60sec exposures.
Color rendering is well balanced, and the bokeh is gorgeous.
A couple years ago, this lens was packaged with its tripod collar. That made this excellent value even better.
Only gripe is that the hood is a relatively poor thread fit to the lens. This being the only thing that I can find to complain about tells something of the quality of the lens itself.