I was a bit nervous given the uneven reviews for this product.  But so far it is exceeding expectations.  I upgraded to 256GB Ram so I can run large scale numerical simulations.  The Xeon processors are a bit dated by today's standards but this is a refurbished computer.  The fans are quiet and it seems to be very stable so far... no blue screens as other have experienced.  A new computer with these specs would be 10x more expensive so this is a very good value.