That's not the Canon hood. That's one of the knock-offs (hence the low cost).
Sure, but it's identical in almost every aspect of the word except that it doesn't say Canon on the outside. It's a cheap piece of plastic. Paying $50 for it seems silly.
I have a 17-55mm coming to me as we speak, and I actually ordered the POTN knock-off hood. I'll be sure to give a small review on it once it gets here. If it's good, I saved myself $40. If it sucks, I'm only out $12, so no biggie.

