This computer replaced a 10 year old Dell Optiplex 740 that had also been renewed.  Although upgraded to Win10 it was slow, especially for photo editing.  The Optiplex 990 with the SSD (solid state) hard drive and faster processor is almost instantaneous in bringing up photos to edit.  Set up was very easy.  By entering my Microsoft, Google and Apple passwords and loading Chrome and iTunes, together with MS Office 2010, and my Documents and Pictures from a mini-hardrive, I was up and running just like the 740 but considerably faster.  My old s/w is on CD so the inclusion of a CD ROM drive was necessary and would not have been included in most laptops.  I do not game so I cannot comment on gaming capability.  The physical size is much less than the 740.  I did not need to use Tech Support.