Ya i have one. Pretty handy tool i thought. I dont have any of the hole cutters though, just the x bit.
Its quicker than messing around getting another drill out and rigging up a hole cutter. cuts thru ceramic like knife thru butter and you can cut what shape you like as they say.
I used it on some porcelain also to cut a hole out for elec cables. Fairly quick on that as well. I haven not tried cutting a larger hole or socket out in porcelain yet though.
what i did notice though is that it chips the face of the
tile as they tell you to use a slight up and down sawing motion to help it cut.
its also handy for trimming holes afterwards if you discover the shaver socket wont fit!!
Reckon im happy with it though.