Pricey, but performs *very* well, and can handle 16GB of RAM and an SSD.  Mine's hooked up to a 4K TV and a pair of 24" 1920x1200 monitors (with VGA to USB3 adapters) and I use it to remote into other systems.  Quiet, takes up no room, and doesn't generate any appreciable amount of heat, which helps in a small office that gets hot in the summer.