Excerpt: I dropped my camera while on a visit to US and this Hood saved me from a big disaster. Hood broken but nothing happened to my Camera and Lens (5D and 24-105 USM). My advise: always use lens hood and save yourself.
Pros: Durable, Easy to Use, Improves Function, Lightweight
Excerpt: With lens hood I feel mush secure about the lens, as (like almost everybody wrote already) it not only reduces unnecessary light, but protects the lens/filters. Was surprised by the high price of original Canon pieces, but when I touched the non-original ones (though 3-4 times cheaper) decided to go for original Canon hood.
Excerpt: Both this and the identical RMA replacement fit loose and can be heard rattling in the wind when shooting video with my 24-105 Canon lens. neither Canon or B&H have ever heard of this problem and Canon simply suggested wrapping the lens edge with white plumbers tape to sure it up.. I don't think so!