I have another printer with dual extrusion capability and I almost never use it. The dual extrusion looks fine on paper but has very limited practical applications. On top of that, calibrating both extruders and their alignment is a real pain in the *.
I didn’t know that Witbox has planned an update of their printer. On first look, it doesn’t seem to be much different than the first version. Yes, the auto-calibration is nice, but not something I miss on the first model (I calibrate it once every 10 prints or so). Also, the extruder and stepper motor mechanism seems to be identical. If there’s anything I would add to the Witbox, it’s a heated bed. If it would have a heated bed, it would be the perfect low-cost desktop printer for me.