[Glass] Well built filter that fits the Nikon Z. Allows me to use lenses that would not accept external filtration.

[Solid ND] DJI did a great job with these. Finally an option that doesn't require third party products. Love it.

[Glass] Nice and experienced crew.

[4.1 x 4 x 2.5"] If you're wanting to have more control of your aerial video settings to make more cinematic looking videos an ND Filter Set is needed.

With this DJI ND Filter Set you will have complete light control for those extremely bright scenes (snow, beach, sand, water) to maintain control of your cinematic video settings.

I use this set along with the DJI (ND4, ND8, ND16, ND32) Filter Set.

Both sets the build quality is high. They are sold and fit exactly/firmly onto the camera/gimbal. I've not had any issues using these ND filters. Color accuracy is not affected and no light aberrations have been noticed.
I highly recommend this as an addition to your aerial video kit.

[4.1 x 4 x 2.5"] My friend has these and told me to get them. So I did no questions asked. I can't wait to point my camera directly at the sun and not be blinded. I think that's all I can ask

[Glass] I love this! I'm sure many of you (like me) saw this as an alternative to using high speed sync, to get more flash power, & not have to worry about glare from lens filters.
PROS:
* Works fantastic!
* Easy to get on & off (don't lose the pick to get it off).
* No glare (like you can get from the lens filters).
* I feel safer changing lenses outdoors knowing dirt won't hit my sensor.
CONS:
* It's a dust magnet. It says dust resistant, but I'm constantly blowing dust off of it. But I just keep a blower bulb handy. To me, blowing off dust when I change lenses is worth it. I think the pros far outweigh the one con.

So if you buy one, AND YOU SHOULD, buy a good blower bulb & censor brush with it, if you don't already have one. FIVE STARS!

[Dedicated] Glass seems to be high quality. Works as expected.

[4.1 x 4 x 2.5"] The Air2s is an amazing drone but the included ND kit isn't quite enough to compensate for the lack of aperture. these higher stop ND filters are a must.

[Solid ND] I have been trying to figure out a way to protect my Sony mirrorless camera sensor from dust and particles.  

My biggest concern with mirrorless cameras is how quickly the camera sensor can get dirty.  

These KASE filters have solved that problem. 

By using a UV or ND filter that fits directly, and safely, in front of the sensor.  These filters protect the camera sensor from outside exposure when switching lenses.  This comes with a carrying case that can hold two additional filters, 3 ND filters, 1 UV filter, cleaning cloth, a guitar pick to remove the filter, finger rubber gloves, & instructions.

Pros:
1. No need to add an ND filter for different sizes of lenses
2. Protects the camera sensor from dust and moisture
3. Comes with 3 different ND filters for your specific scenario
4. Includes a soft frame pad that sits nicely below the filter for prolonged use
5. Very easy to remove or install
6. No overheating issues or problems when using the entire day
7. Excellent video and image quality

Cons:
It doesn't have a snug fit in the Sony a7sIII.  If you remove your lens and your camera body is tilting forward, it can easily fall out.  The instructional video shows that these filters clip-in.  However, I believe the dimensions are slightly larger for the a7sIII.  So to be safe, you will want to remove your camera lenses with the body facing up.  

All in all, this is an excellent innovative product!

[Solid ND] I have tested this on the a7iii and now a7iv, it works great!
My main concern with an nd filter at this price point was a noticeable color shift in the image as I have experienced with other ND filters. There is no color change with the ND Filter in. The clip in filter works well even without the supplied pads to cover any open spaces.
The other obvious advantage of this filter is that it works with all of my lenses, and I don't have to carry around step down or step up filter rings.