Overall happy with HP quality.  I installed a 4-channel tuner and was pleased with the layout, and ease of access to expansion slots.  Two minor issues led to my lowered rating:1.  On install I set up the case as a tower, but the hard drive rattled the case like an eccentric cam.  Once I placed the case flat, the oscillations became what I consider acceptable.  Hopefully this will not lead to early failure.2.  Memory is specified up to 1600 DDR3, but 3 of 4 DIMM are older 1333 DDR3, hence memory operates at only 665MHz.Upgrading memory is usually the last thing I do before relegating a computer to the scrap heap, but in this case it is one of the first things I needed to do.  Same was true of my "new" HP 15" Laptop, which needed double the memory to simply surf the web without frustration using Windows 10.UPDATE:  Purchased a second unit since the first failed after about a year of use.  These are used machines that work, but are not truly repaired or revised in any serious fashion.  FIrst Unit:  Found half the fins of the CPU cooling fans were missing.  This is why it shook like a washing machine when the fan ran at higher speeds.  WiFi did not work.  CPU failed so I actually purchased a second, since the computer ran well after memory upgrade.  Had I replaced the fan immediately it would have been a good investment.  May replace CPU at a later date.  Second Unit:  Rubber feet were damaged, cover would not open without serious coaxing with a screwdriver.  HDD was installed in secondary slot under CD/DVD drive.  Booted once using HDD from first unit successfully, then found power supply to be intermittent.  Expect to get one fully functional unit between the two.  Still cheaper than a new PC for the features, but not as good as expected for refurbished.