I have tried several filter adapter/lens hood systems for my Fuji X100V over the years. Two issues almost every lens hood -- including Fuji's -- has are (1) it covers part of the OVF, and (2) it casts a shadow on the built-in flash.

On the first issue, this is only a problem if you use the OVF regularly, but if you do, this hood might get to you after a while as it covers a significant piece of the bottom right corner. It doesn't keep you from framing the shot, but you just won't be able to see what's in bottom right. Other hoods mitigate the effect by tapering the hood inward, or by cutting a corner out of the hood, but this one is just a solid square block. Thankfully it appears in the OVF out of focus, which helps a little bit.

On the second issue, this hood actually fares a bit better than some others I've used, but it still casts a noticeable shadow near the bottom of the frame. Of course this is only an issue when using the built-in flash in a dark environment; in outdoor fill-flash situations it's much less of a problem.

I'm only docking 1 star for both of these issues, as no hood is perfect in either regard, and it's only a problem if you use the affected features, but it's something potential buyers should know about.

Appearance-wise, this is a very handsome hood. The 1:1 square shape surprised me a bit; most "square" hoods are actually rectangular, and although the product images showed it as square, I wasn't sure if that was just a perspective issue. I think on any other camera it might look a bit weird, but it didn't take long for me to get used to it on my X100V, and now I actually like it. The same goes for the little rotating pin to hold the hood in place. It kind of sticks out (literally), but it doesn't look out of place. However, the lens cap itself looks slightly too large for the camera, so I would probably keep that off until I'm ready to put the camera away.

The filter itself seems to be of sufficiently high quality. I do not have test equipment by which to give it a full technical run-down, but I see no flaws in the images, even at high magnification, and my other K&F filters have never given me any reason to doubt their quality.

In conclusion, Fuji owners love to accessorize their cameras, and this is certainly a nice option that protects your X100-series camera from the elements and glare, while making it look even more vintage. Provided the issues I mentioned above are not a problem for you, there's no reason not to get this.