K&F Concept never disappoints, and this ND/PL filter kit for the Insta360 Go Ultra is no exception. The filters are well-machined, easy to attach, and feel like quality pieces of gear right out of the box. They’re a bit larger than the stock lens, but that’s expected—and honestly, the fit and finish make up for it.Accidentally gave one an impromptu “durability test” (aka dropped it on my concrete driveway), and to my surprise, it came out without a single scratch. Can’t speak to the water resistance yet, but that’s a great start for build quality.As for video quality, these filters make a real difference. The footage looks noticeably smoother and more cinematic—better motion blur, richer contrast, and more natural color without needing to crank on heavy color grading later. My reference clip at 2.7K/120p, ISO 100, 1/240 using the ND8/PL looked clean and balanced right out of the Insta360 app, just slowed down for effect.Overall, these are great ND/PL filters from a reputable brand—excellent clarity, smart design, and rugged enough to handle a real-world “oops” moment. Highly recommend for anyone looking to get pro-looking footage out of such a tiny camera.