The Computer itself exceeded my expectations. It's fast. it's stable. It's a lot smaller than I had expected but that is no problem. Figure a way to yoke a bunch of them together and you might give Cray a run for its money. If you take it apart for some reason, (My reason was to extend the hard drive cables outside the box.), make sure that the START button is properly aligned when you put it back together. Also, there is a handle on the DVD carrier that makes it difficult to slide the cover on properly. I took off the handle and the problem went away. The Windows operating System was a different matter. It won't work unless you go on line and register. The next problem was that it wanted a child's birthday before it would proceed and I couldn't make it understand that I had no child here. It also resisted my attempts to Install Ubuntu as an alternate boot. I finally installed Ubuntu as a stand alone. It worked well but I suspect that there is some residual fragment of Windows because I couldn't do a full backup. I plugged in a virgin SSD and loaded Ubuntu from scratch. All is well.