I needed a small computer to run an FTP server to upload video from my security cameras.  This HP EliteDesk 800 G1 Tiny Computer fit the bill nicely.  It arrived in excellent condition, in fact, it was hard to tell if it had ever been used.  I did a full diagnostic on the hardware and everything was working perfectly.  I replaced the SSD with a larger capacity drive and installed Linux.  It has been running 24/7 for about a month now and has not had a single glitch.