A30 Pro.
Geetech use their own board and firmware in the A30, A30T, A30M, A30Pro and E180. It has not been made clear that the firmware (Smartto) has a reduced set of commands compared to Marlin meaning that the printers can not be modified easily and Geeetech do not support the idea. Technical support has taken 3-6 days to respond and has been basic, only offering a link to a video already available on utube or failing to answer the question Sales have been good to respond but spares can take four weeks to arrive from Hong Kong. So, if you want to tinker with a 3D machine these are not for you but if you only want to print standard materials then it seems to work fine.