At this very favorable gray graduated filter is not bad for sure. The processing is valuable and the threads engage properly. Especially with cheap filters, it is me several times happens that you have to try forever to the threads engage and often wedged it then and could hardly be off again. That's not the case here. However, the big problem is the strong color shift to magenta, which can be removed with color photography only with extreme difficulty. If I have in image editing and assembly anyway, I might as well generate a panel from the Raw file and save me the extra filter-ballast. So for me, unfortunately, a bad buy, the three stars are there, because at the price you can not expect the fundamental processing is neat and the filter is of good use for the black and white photography.
