Excerpt: Easy to fit on and off and turn around for storing. Glad I spent the extra $ to get the Canon product as I travel a lot with my camera and am often putting on and reversing my hood for storage.
Excerpt: I heard a few reviews of third party hoods not fitting well so just went for the Canon hood for my 15-85. I don't regret my decision. It's definitely more expensive but fits perfectly and is built nicely. Would recommend this. One thing to note is that the hood will create a shadow if you use the internal flash (sometimes). Remember to remove it when you use internal flash.