I just received this lens hood. While it seems to be well made, with a nice matte finish to the inside surface of the hood, the big problem is that it is too tight. It takes considerable force to rotate the lens hood into a locked position and too much force to loosen it. That's exacerbated by the tight grip one has to put on it to get it to rotate, putting even more force on the front of the lens.
I made sure to put the 18-55 IS lens into manual focus mode before putting the hood on to avoid damaging the autofocus mechanism, but it shouldn't take this much force to install or take off the hood. Maybe it will loosen up a bit in time, but I'd prefer not putting this much force on the lens until it does. In its favor, it'll certainly won't loosen by itself.
It's going back to Amazon. :-(