Fully functional, with multiple upgrades. Has CRtouch bed leveling system, currently running Klipper firmware - simply plug it into a raspberry pi or old laptop. This gives it "wireless" control as well as infinitely more features over the internet (livestream, pause/stop/start/reload filament/fine tuning/timelapse), and offloads processing to the other device - which on these printers can give it an extra 5-20% speed.
Also installed is a metal extruder gear, vs the original plastic one. Well tuned, has served very well in the past.