First time I have ever purchased a refurbished model.  Computer arrived quickly and I set it up.  A couple of days later I got an error message regarding non-detection of a power supply fan.  That was unfortunate but perhaps not noticed during refurbishment since it likely would not be required to run until the computer was on for a long period of time (and I had shut it down for the weekend at our small business).  However, USTecno was contacted through Amazon website and immediately offered a return.  Best of all, they shipped the replacement to me within a couple of days allowing me to keep the first one (which still worked great) until the replacement arrived so I had no downtime waiting for shipments to arrive.  Of course they paid for the shipping.  Fabulous computer -- fast!!  Recommend this company for your computing needs.