This one sort-of competes with the Intel NUC6i5SYH I published before, but it's more business oriented and the price already includes OS, RAM and storage. It's such a tiny package, yet very powerful.
The two DP ports support resolutions up to 4K@60Hz, which is very welcome.
Please be aware that the seller indicates that while the units are new, they do not come with original packaging - only the mini PC and its power adapter are included. Hey, for this price, I wouldn't mind. You don't really need the original keyboard & mouse that HP provides, as I recommend the Logitech K400 wireless keyboard with built-in touchpad anyway.
Accessing the internals of the 800 G2 Mini for servicing is super-easy with just a single thumb-screw at the back.
You can mount the 800 G2 Mini on the back of a VESA mount compatible monitor, upright on a desktop stand or hidden under the desk. Excellent for most employees, secretaries and the like.
The 800 G2 Mini should be excellent as an HTPC (Home theater PC), but you're probably going to need a DisplayPort to HDMI adapter, either an HP original or a cheap 3rd-party one.