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I decided to try two of these cameras, as the original Samsung cameras on my surveillance system continually failed. (five Samsung camera failures in a two year period). These were much, much cheaper and had decent reviews, so i decided to try them out.
They look very similar to the Samsung cameras that came with the original system. There is some plastic used where Samsung used metal, but overall these seem to be comparable in quality and very acceptable considering the price difference.
The image quality on these cameras is not nearly as good as the original Samsung cameras- but is understandable considering they cost a quarter as much. The daytime images are grainy but still decent. The night vision images/video is much worse, to the point where facial details or license plates can't be seen or read. It's still acceptable considering the price of these cameras, but just know that you aren't going to be getting crystal clear video/images from these cameras.
One last comment- one way that these cameras are better than the original Samsungs is the fact that they still are working months and months after being installed. My old Samsung cameras regularly failed and required replacement a few times a year. (I had to replace five Samsung cameras in less than two years). These seem to be holding up much better.