We added the extra RAM and a large paper tray to the 35 we ordered. Setting up the extra paper tray had to be done manually. The user menu at the top of the printer is not user friendly but adequate. It does not recognize the extra paper tray automatically. We put two different paper types in the two paper trays and when one runs out it switches to the other paper tray without notice and that causes trouble. Overall the printer does its job just fine. A few upgrades to the firmware could fix these issues.