Fantastic Value for money- I prefer the genuine Canon quality, but for the price, you cannot fault it.
I bought a Yongnuo 50mm f1.8 after dropping my Canon 50mm f1.8 prime and as the Canon lens is also plastic, the result was a busted lens.
I didn't know much about the lens, but I was told it was decent and that if I wasn't satisfied I could return it. I needed a relatively large aperture prime for some portrait work that day, so I took the risk and bought the lens.
The lens is a revelation! Similar build quality to the Canon, though it does feel a bit more "plasticy".
Bokeh is excellent, more rounded and better formed than with the Canon.
AF works fine generally, though can hunt a little in low contrast.
Manual focus ring is pretty rubbish, but I rarely even try and use it.
Vignetting and Chromatic Aberration (darkening and colour separation) are still well in control compared to almost every zoom lens.
I have now taken around 10,000 photos with this lens in the last 7 months, as like the Canon before it, it is my general purpose "go to" prime.
I use two Canon APS-C cameras, not full frame.
I consider myself semi-professional.
At less than 2/3 the price of the Canon 50mm f1.8 (and 1/5 the price of the Canon 50mm f1.4) I think the lens is well worth having.
I would highly recommend this lens to almost anyone, short of a true professional.
Easy to use, Compact
Would you recommend this product to a friend? Yes