I was pleasantly surprised when I opened the box - I would be hard-pressed to tell this from a brand new machine. Everything was clean inside and out, everything worked. RefurbConnect also sent me a 4570 instead of a 4590, which was a nice bonus. I removed the hard drive, cloned it to an SSD, and activated Windows off the SSD without problems.There's only room for one 3.5" hard drive in the case, but I was able to replace the 500GB 3.5" HDD with two 2.5" SSDs. There are three SATA connectors on the MB, one was used for the DVD RW drive, leaving two connectors for other drives. I had to use a SATA power splitter to provide power for the second drive, and of course had to provide my own data cable for it as well.There is one long PCIE slot I haven't used yet, but I added a USB 3.0 half-height card in the short 1x PCIE slot and that worked fine.The only issues I had were:- I spent a lot of time looking for the Windows 10 activation sticker on the computer after I glanced at the Windows paperwork they sent. However, there was small print in the booklet saying systems with a Windows 8 sticker would not have a sticker. Activation proceeded fine.- It came with probably the cheapest keyboard imaginable, though it was USB. I had a problem with the / key, which seemed to be due to some metal piece that had fallen from the right shift key. However after removing the metal piece both the / key and the Shift key worked perfectly fine, so I'm not sure where the metal piece came from.All in all, this was a surprisingly good buy, it seems perfect as a Blue Iris server, and the CPU load is low enough (only 3 2560*1440 cameras) that I could use it as a Plex server and download box as well using external drives.