I was very hesitant to buy a refurbished computer, but was encouraged by some of the previous reviews. I needed to replace the computer due to the phase out of Windows 7. The original shipment had the incorrect computer - only an i5 processor vs the i7 ordered.  The seller responded very quickly regarding the return and re-shipment of the correct computer at no additional cost to me.  The computer was clean and basically new except for some minor marks on the tower.  It works very well and very fast with none of the "bloatware" that comes with many retail purchased computers. I am happy to get a Windows 10 Pro - i7 machine cheaper than an i5 windows 10 Home machine.  It has plenty of space for me to add a 4-tb hard drive - it was plug-n-play, very simple.  Final Tower was provided as specified in professional packaging. I did replace the keyboard and mouse with upgraded hardware at my choice - no worries - plug-n-play. The solid state drive is an excellent attribute enabling fast response with working files and programs. The four USB 3.0 ports (all located on the rear of the tower) are quite fast and easily identified with their blue color.Only negatives & suggestions: 1) I was getting an error with some of the times it booted, but it appears that the issue may have been corrected with some recent updates; 2) It would be convenient to have one or two USB 3.0's on the front of the tower.  All USB's on the front are 2.0's; 3) HDMI port would have been a nice attribute, but the digital monitor output works great.