Summary: Wanted a fast 2.8 lens for portraits and this one fits the bill. It noticibly smaller to hold than my 70-300 and the zoom is smooth unlike the 70-300. Also zoom do not extend which is a big plus. Lens is sharp wide open except maybe around 150 but still servicable. The bokeh is nice. Only thing lacking is VR but I knew that.
Pros: Consistent Output, Durable, Easily Interchangeable, Fast / accurate auto-focus, Lightweight, Rugged, Strong Construction