One or two minor gripes, like I had to add an external MOSFET to switch my spindle on and off, but otherwise it just worked straight out of the box. The UCCNC software is pretty intuitive and works well too, and seems to offer a fair amount of scope for customising your control screen, though I'm only just getting onto that. And Balazs at CNC drive is OK at responding to questions/problems, even from newbies.