I used this to drill a bottle for my wife who makes bottles with white decorative lights that go into the hole with a stopper at the bottom. Works well but takes some time to drill through the glass.
I bought this to cut through the stone tiles in our bathroom. The stone bat I had didn't touch him. The diston bit worked. It took a while to pierce it and I had to cool it down by spraying some water on it. But it worked.
I used this drill for drilling holes in non-draining ceramic pots and it worked very well! I was afraid I would break the pots, but I didn't. I've used it on 4 pots and the blade is just as sharp as it was out of the box. I am very happy with this purchase!