I've used K&F filters previously and was looking for something to protect my front element from getting inadvertently scratched. After all, glass can be the most expensive part of your photography kit. This has gone onto a Zoom lens which I rarely use other filters on, a 24-205mm zoom with a 77mm thread. The reason why I mention this is that if you intend to use filters a lot, and are using wider zooms (in the 16-24mm range), I know vignetting can occur even with two filters attached. So on my wide angles, I normally have either a CPL or ND filter as I'm capturing sunsets/waterfall landscapes and an additional UV filter wouldn't be of use.

But for a walkaround lens, something like this will protect your front lens element from scratching with minimal light loss. I'm using Sony G lenses on a full-frame 61MP camera, and I've not really noticed any loss of resolution, sharpness, or a bad colour cast with this filter. As an entry-level filter for 90% of users, it offers great protection. If you are a professional photographer, who relies on your photography for a living, I'm sure that you would find better alternatives at a greatly increased cost, but for most beginners and amateurs (I'd consider myself after 9 years, an "amateur enthusiast") it's perfectly fine.

The included cloth is fine, but honestly, I've got so many, I'm not sure I'd use it. The spare cap and lanyard works well, yes, it fits the filter perfectly and it's always nice to have a spare. But the important thing is how it affects images and I saw no negative impact at all.

So, overall, good value, entry-level protection for beginners and amateurs that won't have a major negative impact on your images.