Is barely warm, makes no noise and running reliable so far. Excellent choice, though I think almost oversized for my purposes, but the way it is future-proof :)
Assembly instructions are not there, but should be online to find (have not checked). Please note: The small metal part is very important because it is the heat sink for CPU and chipset and conducts the heat to the chassis. Correct installation is extremely essential, otherwise you do not last a lifetime at the minicomputer.
Did "Digitus USB 2.0 RS 232 serial adapter with USB extension cable" ordered as a null modem cable. Works well under Linux (with gtkterm, 9600 baud).