I hesitated at the beginning because of the price, because I was like "a piece of plastic, it is a plastic tip ..". And why pay 24euros while the equivalent exists on the same site for 8euros ..? However I have read reviews that were not reassured me about the quality of competing products (poor fixing by sun tends to fall etc). I finally chose the Canon EW-63C and I do not regret it. Certe is a bit expensive, but at least it was worth the money and no surprises. Design quality, accurate fastening and sourtout easy to clip without forcing. What I find so reassuring force since its purpose is not a good idea if you want to keep long time ... And above all the ability to place it upside for the store and take up less space. Thing does not necessarily offer competing brands.
Having bought to protect my lens mainly because not wanting to filter, I can not yet comment on its efficacy against the sun. However, it's protection level that I expect from him. It reduces the likelihood that my front lens takes a bad shot.
Last precision: The announcement of Amazon actually confusing. I confirm that it is the sun visor for the "Canon 18-55mm f / 3.5-5.6 IS STM
