Product advertises as HP Prodesk 600 G1 Sff but I received the  HP Elitedesk 800 g1 Ultraslim form factor.  It is smaller without expansion bays that was displayed.  The device booted directly into the desktop, so I had to reset/delete it back to the windows 10 pro startup.  Seems to work fine and I can make use of it, but I am disappointed that I didn't receive the model that was advertised.