Better than anything else in the price range.

If you consider for what prices similar is sold, it is here with 7,85 a good deal.
The product looks solid and well made. For the focus ring on my 50mm f1.8 (The good Mk1 and Mk2 not new with the focus ring on the front) I have an extra layer of narrow Fensert insulating tape attached. This will probably have to be the case with thin Fokuring with other lenses.
It would be nice yet a marker. I have, however, just tinkered from a paper point and Tesa. With a bit of skill, it is useful. The lever is also longer than that of similar products. For almost 8 to make here certainly nothing wrong.