I've tried the K&F Concept 4 magnetic filter set for my DJI Osmo Pocket 3 and am overall satisfied with it. The filters are easy to mount and remove from the gimbal, which is a big advantage for me as I usually want to leave the filters on while using them. With some other filters, I always had to remove them so that the lens head could fold correctly — that's no problem here, they're flat enough for the Osmo Pocket...

The workmanship looks high-quality, the magnetic aluminum housing makes a solid impression and the lenses are clear and distortion-free. I particularly like the effects that you can achieve with it: The Star filter creates beautiful lighting effects with point lights, such as water reflections or fairy lights, without being abstract. The Blue Streak filter is also interesting for turning bright light sources into lines, which can be really cool for urban night shots.

Overall, I primarily use the filters for creative effects in my recordings, especially for travel and city photography. For people who like to experiment with lighting effects, the set is a good addition. For the price, I find the quality and handling very consistent.