I've only bought two (out of 9 personal) computers. But the first, an AMD486-50 (real 50 MHz '486, not doubled or anything) and it used all "industry standard parts," so I was able to upgrade and add as I saw fit. (And I DID! I added a sound card, extra memory, a PCMCIA card, and enhanced EIDE.) unfortunately, the D*** is a complete disappointment. It crashed with one of their "updates," and it took a total of two weeks and five sessions (and $100) to get it back to some semblance of operation; the "backup" (hidden) partition was blown away by one of their Techs in the process, and the USB 3.1 Port no longer works. If I live long enough, you can BET my next computer won't be a "store-bought" or pre-made box!