When I was a boy, in the 80s, my father's photographic kit was full of special effects filters, including the one to make stars around street lamps and the one to make streaks.
Then, aesthetic taste changed, and these types of special effects fell into disuse.
With the advent of digital, many physical filters were replaced by just as many effects generated by post-production software.
However, given the return to vogue of "star", "cross" and like this "gold streak" filters, mounted on the lens and not generated by the computer, evidently digital effects are still not as satisfactory as optical ones.

I bought this K&F out of curiosity, thanks to the Vine program. It is part of the "good" line of the Chinese manufacturer, the one called Nano-X. I still haven't fully understood the difference between the three series of K&F filters, Nano-K, Nano-D and Nano-X, except for the increasing presence of anti-reflection layers, 18, 24, 28.
The quality of the optical glass used should also be superior.

The fact is that this Nano-X Gold Streak does its job well, creating exactly the effect for which it is sold, that is, the golden lines around the point lights, without muddying the image and without introducing dominants or muddying the image.

However, I have noticed two problems:
1) you have to be very careful not to tighten the filter to death otherwise it becomes very difficult to unscrew it. Just bring it to the stop, it doesn't unscrew by itself.
2) in some situations the focus can be fooled by the golden stripes. It is not a defect of the filter, but it is physiological. Better then to set the focus to single point, also because with these filters, usually, you take photos of urban landscapes or in any case static.

The construction is really good, with a very nice matte paint (perhaps it is also the one that makes it harder to unscrew the filter) and a wonderful looking lens treatment, as well as water repellent.
The case is a bit large because it is intended for all diameters (mine is 67, but the case can also accommodate those of 82), but well made and with a rack that does not make the filter fall even if we open the box upside down.