I also wondered if anybody had any experience of this type of Chinese machine: Ball Industrial CNC Slide Rail Guide Syetem Mill X-Y-Z Engraving machine Motor | eBay

...I've absolutely no intention of buying one as I don't want the risk involved with Chinese CNC quality control, but the size, component spec and claimed accuracy all look pretty good value for money. Coupled with a water-cooled spindle and decent electronics, it would make for quite a cheap build. I've searched the forums but couldn't find reference to this (only the 3020 / 6040 machines that are all over ebay) so wondered if anyone has any experience of these machines?