That's completely cool and all, but it would only do so much. It can help you do office work yeah. but, if you game, produce, design high ram graphics, render or use specific programs for work/hobbies that don't have an app version... it won't really help.
Not completely decking the fact that it can be useful.
Just running it against your standard Set up, most people have a phone, a tablet and a computer as you pointed out. It can easily replace the tablet, i understand. But to go through the ceremony of hooking it up and unhooking it up as a desktop is something that can be completely avoided in most people's situations by pressing the power button on their pc.
Why fiddle with something that's probably less powerful in the long run anyway? I mean if you intend to play games or produce music or render anything for a 'job' then its pointless.
Secondly, the set up requires an external power source for the monitor... so unless you have a portable monitor i don't see it replacing your laptop for serious on the go work sessions.
And If you're at home, the app set up and limited permissions the phone has makes a vast majority of applications null and void on it. So it'd be better to just use your desktop.
Again, this is just from a very techincal stand point, I work with computer applications and IT at my part time job, and we've seen smaller projects like this. It always feels like a 'cool you can do this if you want to!' and you do it once or twice to feel awesome that you can... but then you realize that in most cases your actual computer is better or faster... and it only serves as a good 'back up' ... hardly ever a main priority.
But that's just my take on it.
