I received this computer about a month ago.  It has performed flawlessly for a month.  Any problems were due to my own lack of knowledge.  From the BIOS setup I found the manufacture date as 2015.  It's the newest computer I have ever had, so I have a lot to learn.  It has not frozen or stalled once that I remember.  In appearance it looks like new.It came preinstalled with a fresh copy of Windows 10 Pro.  It did not come with a reinstall DVD.  On the first boot I went through the setup procedure as usual.  I checked out some of the hardware.  I used Western Digital's Data Life Guard Tools to check out the hard drive and it passed the quick test.  The SMART Drive monitor checks out as OK.  The installed memory was not up to specifications, but works OK.  The BIOS is smart enough to run the machine at the lowest speed memory stick in a stable manor.  The refurbisher put in one 2 Gb stick at 1037 Mhz speed and one at 1300 Mhz speed.  The specs are 1600 Mhz I think.  The machine runs at 1037 Mhz according to the BIOS.  So it is slower than it could be.  Still it is quite a fast machine with a 3.6 Ghz, quad core processor.  The DVD-RW drive works very well also.  It has dual layer capabilities and good read and write speeds.  I think it is a Toshiba model.  It came with a USB WiFi adapter in an anti-static bag.  Windows had the drivers preinstalled.  It works OK, though I have one that gives greater signal strength.  All the ports are OK and there are quite a few.  The USB 3.0 is very nice to have.  Even my USB 2.0 devices work faster.  My Seagate USB 3.0 external drive works very well.  The display port works OK, but I couldn't get my TV to work as a monitor;  I used a display port to HMDI cable, but couldn't figure out how to program my smart TV.  The signal was getting there OK, but the TV wouldn't display it.  I bought a little used monitor which works great on the VGA port.  The sound is OK and the computer has an internal speaker which works.  When I look at Device Manager in Windows, everything checks out OK, no red or yellow marks.  Seems to be a very good machine.  It can boot in legacy and UEFI mode and you can use secure boot or turn it off.The Refurbisher is SKYTECH USA LLC.  I just looked in my orders and clicked on the same item and looked down the page and see that now a different Refurbisher is offering a nearly identical model at a slightly lower price.  I guess more than one Refurbisher offers the Optiplex 3020 like this one.  So don't know how reliable this other one is.  My only experience is with SKYTECH USA LLC.Overall, I am very satisfied with this computer and you can't go wrong for the money.  I think it only took about 10 days to come and came a little earlier then expected.  Based on this one experience, I recommend SKYTECH USA LLC.