I've had one for a for a few months that I came away with for about 150 since I had a lot of trade in credit from my WiiU/3ds. I reformatted mine to windows 10 to have a bigger game selection, but the hardware alone makes for a nice:
1. Media Center/Plex Client - with enough cpu to muscle through odd codecs, 4k netflix/youtube, etc (HDMI 1.0 so 4k output is limited to 24/30hz).
2. Emulation box - when combined with XB1 controllers, the XB1 wireless adapter and Retroarch (which auto-configs controller profiles for different systems/multiple players, and has a really nice, TV-friendly UI with super crisp CRT filters). Dolphin also does pretty well, though I haven't tried syncing wiimotes via the bluetooth. There is way more power and broader support for different systems for a quad core x86 than there would be for say a raspberry pi or android.
3. Party machine - for playing whatever low-fi indie 2-4p game of the week is big on steam and older games/emulation as mentioned.
4. "Backup" mid range gaming PC - for LANs or guests. It can definitely handle source games and Overwatch 1080p @ medium/high 60fps (will need some kind of usb connection for headsets/etc, only has optical and hdmi audio out).
5. Steam Streaming client - if you already have a more powerful PC in the house (wireless AC/Gigabit, and more than enough cpu/gpu to handle decoding).
It's incredibly quiet, and never feels hot even under strain. Just a super versatile, living room focused PC with a weaker GPU. There's a really nice cushioned carrying case ($30) if you get it chock full of emulators/and steam indies and want to take it to a friends place for couch multiplayer .