Excerpt: This lens is used shooting wild birds in my local area. It is lightweight and operates very quietly with the STM feature. I am able to move and shoot easily holding the D70 with this lens attached. I plan to take it to South Africa because of its portability, where I can reach out and capture wildlife of all types from moving vehicles. The IS feature works very well from the backseat of a motorcycle traveling on paved roads at a steady speed.
Pros: Durable, Easily Interchangeable, Fast / accurate auto-focus, Lightweight
Excerpt: Purchased for half off on ordering a 70D Kit from B&H. Took it to the local greenway; my first picture was a very sharp shot of a blue heron, allowing cropping to fill the frame, from quite a distance, with fine feather detail. I've since posted photos to Facebook for the first time since 2009, with tons of kudos received.
Pros: Consistent Output, Easily Interchangeable, Fast / accurate auto-focus, Lightweight, Nice Bokeh
Summary: I shoot mostly handheld photos, and my 75-300 zoom was good, but I lost many shots due to jitter. I selected this lens for the Canon Image Stabilization technology. In my first shoots, my expectations have been realized. (If your hands shake too much, get a tripod or a movie camera.) I shot long distance - 500 feet at night - and got a very sharp picture! I am looking forward to some great photography with this lens.