Summary: Having purchased a cheaper alternative, I experienced severe vignetting but only in one corner. I finally bit the bullet and purchased the Canon version and the problem was solved. Side by side the two hoods were similar but the third party one was thicker and taller.
Pros: Durable, Fit For Purpose, Rugged, Strong Construction
Summary: Excellent for the job, usual complaint with Canon, should have been supplied with the lens.Initially bought a cheap version which vignetted all the wide angle shots, wasted my money.Easy to fit with clear markings, and can be reverse fitted to lens to make easier to carry in a large pocket whilst another lens is fitted to the camera.ADVISE buying the Canon version in the first place for satisfaction!
Pros: excellent quality., perfect for the job.
Cons: dear for what it is., should be supplied with the lens.