A good printer that prints to reasonable quality and relatively quickly. The A3 scanning facility has already proved very useful, however you can only scan via A3 using the HP scan software.
I purchased the two-tray version of this printer so that I could have both A3 and A4 trays on hand as I frequently print both. Unfortunately, storing A3 means leaving the tray on a setting that leaves it sticking out from the front of the printer by 3 or 4 inches. Not ideal, but not insurmountable for the convenience it offers.
The duplex printing and scanning facilities have proved very useful.