Summary: It's a "must-have" if you're working outside. Quality etc. all great. The only reason it gets three stars is because of the price. This item should be included with the lens, just like a lens cap.
Pros: Durable, Easy To Use, Improves Product Function, Lightweight
Summary: I finally got around to picking this hood up for my 17-55mm lens. It's really big, so I'm only using it during sunny days. For the night it's too cumbersome for me & gets in the way while zooming. Canon should think about enclosing this with the lens. At ~$45 it's pretty expensive for a piece of plastic!