The ECS Liva Z Plus is a UCFF PC system with an intention to be used for business and personal use. The main selling point is that it uses an Intel Core i5 7300U 14nm Kaby Lake SoC in such a small form factor, with vPro enabled. The CPU uses Intel 620 graphics and supports 4K Playback. So it's also good enough to function as a compact HTPC unit.
NUCs have been around for a while. Zotac makes mini PCs with and without gaming centric GPU. They have good usefulness as a general PC. What I liked about Liva Z Plus offering was that it is in the same form factor and design as its Apollo Lake SoC version ?Liva Z?. Usually, such units are barebone devices, but this does come with a single DDR4 module, a 128GB M.2 and the BT 4.0+ WiFi AC adapter. This is ideally good for those who need out-of-box usability, but it also has room to make some upgrades.