From never being satisfied with the BigBox and Rumba with either Marlin or Repetier I'm impressed how easy things are now with Duet Wifi and PanelDue. It is worth the money and some more because things just work and David Crocker (@dc42) is always ready to help. In The Duet forum and here as well! I got mesh bed leveling with the Bigbox IR-probe (Davids probe) on alu bed painted with PEI and every print (10-20) has been spot on on the first layer after initial tuning. Then it's really simple to change the Z-offset by gcode and in config. I struggled with dual Z stepper drivers and dual Z endstops (max) in Marlin and Repetier. With a little help Davig got a workaround working perfect until this will be a supported feature. I really do not need better support than the workaround as it does the job in a very simple matter. Whenever I want to print now I do not even bother to be at the printer. I just go check a few minutes later to see it prints as it should.