It was rough to start as he didn't want to use the new machine (even though I followed all instructions and it was turned off etc.)
He loved the box that it came in! he is still playing with the box.
After a few days, he moved over, I kept encouraging him to move to the litter robot, putting treats at the entrance to it etc.
As his other tray got dirty, he had entered the litter robot a few times, just to check it out, then run away.
Eventually I then removed the other option, hopeful that he would use the litter robot and alas he did.