Stallion Tek of Upper Marlboro, MD, provides outstanding conscientious customer service.  I needed to upgrade my desktop to Windows 10 in order to install TurboTax 2020.  I spent several hours unsuccessfully attempting this and finally decided to order a refurbished machine with 10 already installed.  The day the replacement computer shipped I tried to install 10 one more time, now choosing a different option that did not retain all the original files and it installed perfectly!When I contacted customer service at Stallion Tek and explained my unusual circumstances and that the box was unopened, the agent stated "Sometimes things like that happen" and that he would refund the ENTIRE cost including sales tax and the return shipping cost!!  I consider this customer support above and beyond the norm!I had selected this machine because of the very positive reviews and have no doubt it is an excellent computer.  To be able to return it at no cost to me was truly a gift, and very much appreciated.  After reviewing their website and my personal experience I can recommend you check them out for all your computer needs.