HDMI doesn't give power the way USB does so you still need a USB power source from some place I believe (many Tv have them these days) but this is pretty cool.
Any TV is a smart tv now
Instead of a laptop carry around a small monitor keyboard, and mouse and this thing. Much easier to keep on a keychain or something and less likely to get stolen because less likely to be unattended.
Build this into my phone. I've long wanted a phone that could be the brain of my workstation, tablet, etc and be as mobile as a phone. Forget syncing all my devices... One device to rule them all. It's always been just a matter of time. Maybe the time has come.