K&F concept are a really reputable brand and this will be one of many ND filter sets I have purchased and received from them. This specific listing for the Osmo Action 6 with a CPL+ND8+ND16+ND32+ND64+Black Mist 1/4 is something that's blown me away.Each filter is expertly made and feels highly durable and tough. They fit the Osmo Action 6 perfectly. I have no comments on K&F Concept's packaging, although it does look nice so yes it's suitable to be gifted to an Osmo Action 6 owner.K&F Concept, and these items specifically, deliver excellent performance. There's none of that X-shadow that is a mainstay in cheap terrible filters. Rather these filters are made to a high standard clearly have very good quality control, and testament to that quality is the rather high price. However you can be sure that in purchasing these filters you won't have to buy another set for the lifetime of the use of your camera given that you treat them right.Currently the filter set is on offer for £48.32. That works out at just over £8 per filter. Is this set for the use of hobbyists? Yeah. Is it for amateurs? No. Is it suitable for professionals? Absolutely.I think you need a certain level of skill to be able to effectively use the different grades of ND. But again if you want to take that jump and make that rather big investment, I don't think you would regret it. It will level up the outputs of your Osmo and allow you to achieve more cinema-quality footage that the camera is capable of but needs that helping hand in tough outdoor environments.