Anyone has experience with imitation Canon lens hoods?

Hi,

While looking for a lens hood, I found out that there are some imitation lens hoods made and sold by some Hong Kong companies (for example: http://www.ebay.com/itm/EW-73B-EW73B-Camera-Lens-Hood-for-Canon-EF-S-17-85mm-F4-5-6-IS-USM-24-85mm-f-3-5-/160811888395?pt=LH_DefaultDomain_0&hash=item257122af0b ).

Has anyone had any experience with these hoods? They are ridiculously cheap (like 1/10 of the overpriced Canon hood). From the pictures they look just like the Canon ones. Perhaps they are cheaply made. But a lens hood is a lens hood is a lens hood, as long as they fit tightly (but not too tight such that it damages the lens barrel), I would give it a try.

Thanks,
--
Howard
cameras: 5DII, 50D, D60, Rebel 2000 (film)

lenses: 17-40 f/4 USM L, 24-105 f/4 USM L, 100-400 f/4.5-5.6 IS USM L, 24 f/3.5 TSE L, 35 f/2, 50 f/1.4 USM, 100 f/2.8 IS USM Macro L, 300 f/2.8 IS USM II, 430 EX II, Kenko Pro 300 1.4x TC, EF 2x TC III
personal website: http://www.travelerathome.com
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