I was lucky enough to buy their one Demo Disc while at 2019 SEMA show. I have now used it several times and it's worth every penny. Metal, ceramics etc, it cuts or sands through everything. So good I am now buying another for my 2nd location. The only thing missing is the Mandrel / Arbor bit you will need to fit this bad boy. I needed to buy a separate 1/8" screw with 5/16" base & cap, I wish it was included.