well + simple = simply good

I use the lens hood to a Canon EOS600D with kit lens. The screwing was smooth - only you have to take care, not to tilt the fine thread. When 18-55Kit lens, it is important that the lens hood as far tighten that when a keyed Zoom (18mm) / are the large protrusions of the panel top to bottom. Otherwise it comes to vignetting.

The lens hood helps against stray light, but is also known as "bumpers" sense (and looks stylish from -meint my daughter).
In my opinion, an absolute "must have".