I picked up the K&F Concept ND/CPL filter kit for my Insta360 GO Ultra and honestly I’m pretty impressed with what you get for the money. The filters feel solid and well-made – the aluminum alloy frames don’t feel cheap or flimsy, and they thread on smoothly without that “gritty” feeling you sometimes get with budget filters. The glass itself looks clean, with no obvious color casts or imperfections, and the multi-layer coating seems to do its job keeping reflections and flare down.Out in the field, the ND8/16/32 options give a nice spread for different lighting conditions, letting me keep shutter speeds in check without blowing highlights. The CPL is a nice bonus, especially when shooting around water or reflective surfaces – it really does help cut down glare and make colors pop a bit more.In terms of image quality, I haven’t noticed any serious loss of sharpness or weird tints. There’s a very slight darkening around the edges with the stronger ND filters if you really push them, but nothing that ruins the shot, and it’s kind of expected at this price point.For value, I think this kit hits the sweet spot. You get four very usable filters in one package, with decent build quality and coatings, at a price that’s way less than some of the “big name” filter brands. For casual and even semi-serious shooting with the Insta360, they do the job really well.