It has been upgraded with following things:
* Automatic Bed leveling
* filament run-out sensor
* Additional Z axis with extra stepper motor for extra stability
* Upgraded Extruder
* Upgraded print head cover for better ventilation
* LED lights on the print head cover
* 0.6mm nozzle and a kit of various nozzle sizes
* Bed insulation for power savings
* Upgraded Bowden tube
* Most of the original parts which got replaced in the upgrades