Boy I have not. Their online and phone support is nonexistant. I had a dual core, and while it "generally" did not work that bad, one USB port (of only two, the only ports on the entire machine) went bad for no reason. When I first bought the thing, I tried to get the bracket which holds the hard drive, generally called a "caddy." So I called support, and they had NO IDEA what I was talking about. "Don't show such a replacement part."
(This, again, was so I could have two hard drives, one to play with Linux, and to "leave" the original alone to insure I didn't screw it up.)