This is the second of these computers I have purchased from Amazon in the last month.  The machine itself is quite fast and so far works well, so you really can't go wrong with a 16 GB machine running Windows Professional for less than $400.  Amazon's own explanation of Amazon Renewed, states, "Professionally inspected, tested and cleaned to work and look like new."  Somehow, I was sent a power cord that had one bent prong, and the ground prong was missing completely.  Obviously, really well inspected.  These units do ship with a USB mouse and keyboard, but you likely won't use them - they are complete garbage.