hi,
   has anybody tried one of these? they seem very well specked and competitively priced,but do they work??

http://www.ebay.co.uk/itm/CNC-4-axis-CNC-USB-Interface-Breakout-Card-Mach3-for-Router-Mill-Machine-/261082603801?pt=UK_BOI_Industrial_Automation_Control_ET&hash=item3cc9bc6119


Tony