I've not tested it on ceramic, I was so preoccupied with getting it working on Porcelain that I didn't consider that. I have a feeling the cutting head will be too coarse for ceramics or it may need to be used wet.
I could make some less aggressive cutting heads for softer materials.
These also have a very small element of adjustment built into them, there are a couple of 0.25mm thick shims in the construction of the tool that can be removed if there is wear over time. I can give instructions if these need to removed - it's pretty simple.
I think a rough cut mitre first then using this tool is a great idea, it will substantially extend the cutting head life.
The WD40 solution might be a side effect of dry use, that could be another plus towards using it wet - waste material removal that will stop the tool clogging long term.