I have always purchased HP's for myself and my company, and always had two sided print. However, when I purchased a second HP for myself, I thought that feature was included in the system. But, surprisingly, it did not, and I learned that HP markets this feature separately for about $80. The reason I like the duplexer is because it does save paper, great for greeting cards, easy to install, and allows card stock. However, it will not support support 8 1/2" x 11" photo paper (Big Time Jams). Its support center puts you through a number of ineffective steps, but in truth there is no way to solve that problem. The duplexer sticks out 2 1/2" in the back of the printer.