Pretty cool but I'm not coming up with a decent use case. Once one plugs in the power cord the coolness factor drops a couple notches. I don't see a mention of bluetooth. Do you have to hang dongles off it?
So basically it's an HDMI stick with a Micro-USB port for power. You plug the stick into your TV or monitor, then loop the power into a USB port. Most new televisions and computer monitors have USB ports, so you just re-purpose one to give power to the stick. The HDMI port handles audio & video; wireless connections include WiFi & Bluetooth, and some models have an Ethernet port. Also a MicroSD slot if you need more local storage, like a 128-gig card. You can hook up a wireless keyboard & mouse via Bluetooth, or use a USB wireless model with an RF transmitter like the Logitech K400. If you need more ports, you can get a slim USB hub, but even a lot of printers are wireless now, so it's usually not such a big deal if you're using say a Bluetooth game controller & remote control.
While technically it can be a computer, it's more of a basic Internet surfer & media player than anything. I can see it being used in offices as simple workstations and for basic HTPC's. I have a first-generation model from Lemel and it gets waaaaaaay too hot for me to leave plugged in all the time. That was the first-generation product; the new Atom X5 & Core-M models are the second. It's going to take some more CPU shrinkage, probably to even under 10nm, because they start getting really good, I think. Atom graphics are starting to improve to the point where you can play basic games pretty nicely, so again, a few more generations and these things will be a lot more useful.
What it boils down to though is that it's more cool than anything. You can buy a NUC or a Baytrail-T or Atom box for cheap that uses minimal power, has more ports, and is hardly obtrusive at all (just velcro it to the back of the screen!). But like all new technologies, they have to start somewhere, and the first generation of a lot of tech is sometimes not super usable. Again, they work right now as basic computers, but eh...buy a MINIX and get more ports, haha.