John Siracusa, in 2005, for Ars Technica:
Ladies and gentlemen, I give you the xMac. My xMac. The Mac that I want to buy. Reduced to one sentence, it’s a completely configurable, headless Mac that trades expandability for reduced size and cost.
The idea of the xMac is older than this article, as John explains, but it’s pretty simple: a Mac that trades some of the flexibility of the Mac Pro for a big reduction in price. A Mac mini-priced system with a few PCI Express 2.0 slots, a nice RAM ceiling would tickle the fancy of many Mac nerds who dislike the iMac’s severe lack of upgradability.