Been using this for 3 years since my tower died.
VivoPC-VM40B2
Celeron 1007U Dual-Core.
Upgraded to 8GB ram.
500GB HDD.
It was a huge downgrade at first. Firefox and Chrome would take 2-4 seconds to load, Excel takes 7-10 seconds to load.
Transferring a huge file from one source to another takes up 100% CPU usage, which makes watching YouTube videos and other tasks lag.
I'm still using it and I love it.
Dual monitor set up, 3x ext HDD plugged in, Firefox and Chrome opened for each monitor, and it's not sluggish. I torrent, stream, browse, play mp3s all at once. Totally usable.
Built-in speakers, WiFi, Bluetooth, memory card slot... etc.
The only downside to these mini pc is a lack of USB ports. 4 is not enough.