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The device looks pretty cool, but omg the marketing copy is super cringe!
I couldn't wade through it to figure out what it even is. Too much zazz.
Yes can someone please explain some simple use cases. Why is this a thing?
You could just go look at the videos section.
It's a KVM.
More specifically, you plug this thing into your raspberry pi/whatever's HDMI and USB port, and then run their app on your smartphone, and on your phone you see the video from the device, and can send input (keyboard/mouse) to it via USB.
25 years of IT industry experience, no idea what this actually is.
Sounds like it could be used as an IPMI style KVM, among other things.
PSA:

For the love of jeebus do not attempt to read the corp speak. I’ll save you the trouble.

Wireless HDMI, plus usb for $99. Currently on sale for $79. That’s it.

This corp speak made me so irrationally angry, I had visions of starting a protest of the product… but it’s honestly good and fairly priced, I think, for what it is.

Fire your marketing department and make that discount permanent.

The page doesn't even show an example setup! All I see is a HDMI dongle with no idea what the use of it is. The text doesn't help at all.
Based on the video (on the "videos" tab), the test setup seems to have ~120ms of latency.

- The Youtube video is 30 fps (right click, select "Stats for nerds")

- I measured ~4 frames of latency between the source device and the mirrored image as shown on the iPad screen

This isn't a scientific measurement; there may be other factors contributing to this delay, but this assessment is based solely on how it was presented in the video.

tl;dr: Probably not good for anything that requires tight timings, such as the fighting and rhythm games used in the demonstrations. The individual in the video mentions "almost zero latency", but I think anything beyond a casual gamer would notice a delay of >100ms.

Took a punt on one but fully expect to be hit with customs in the UK.