It was an I phone 4 I think, done it last winter, had to build a wetroom for client. That triangulatior piece had to be done so the old boy could get his wheel chair in
If it helps what I do on porcelain is mitre the tile leaving a couple of mil on it, then take that of with a polisher, time consuming but stops it from chipping. I've got the Dewalt cutter but I find it doesn't cut true on a 45, next time I have to do a load of mitres will try that mitre wheel from ats