I did a couple of sits recently with automatic machines. The first used regular litter and scooped it out into a bin below that we had to empty and we had no issues.
The second one was one I had not seen before–it would automatically clean the plastic litter pellets and break down the poop, and it would all flush out through the hose connected to the toilet. So besides cleaning up the litter that tracked out of the box, we didn’t have to do anything. The only downside was that it was pretty noisy–they kept it in the bathroom in their bedroom but it never seemed to wake us up–either we totally slept through it or they didn’t use the boxes much overnight.