Excerpt: I hate the elephant hood that came with my 135L, so I got this to replace it.<br /><br />Now my 135L fits in my bag with the hood attached, and looks vastly less silly. This hood isn't actually /that/ much shorter (though enough to make a difference) but it looks MUCH shorter and less silly.
Pros: Durable, Easy to Use, Improves Function, Lightweight
Excerpt: Canon lenses are bizarre - the hoods are so different. The newer style with the release buttons seem nicer.<br /><br />I have a 35mm 1.4 L lens that came with this hood, but it was so tight and difficult to install/remove that I thought something might be wrong with it - the new one I ordered is even worse...oh well...<br /><br />So why did I recommend it? You need one sometimes and if you have that lens, then it's the best option.