To me, the other cool thing about this is that if you decide you wanted to play a game with a mouse and keyboard (say a strategy game or the like), you could hook it up to your work setup and off you go.
Not really a use case for me since I have a self-built gaming PC, but I could see it if I didn't.
I think this thing will be a great thing for me to enjoy my Steam library (vast majority of which is indies) and some emulation on the go, as well as possibly docked on my TV rather than moving my PC over every time I want a couch rather than a desk chair
We will see how much I end up using it, but at the moment I am excited.
As a nerdy aside, can I also add it's pretty cool to see a gaming PC running Linux? I really, really hope it works as well as Valve thinks it will. I've been tempted to run SteamOS for some time but it never quite met the bar. I'm hopeful for 3.0