Installed two towel rails in a couple of showers, we have just installed new tile trim - 12 holes in total. I bought two of these just in case but one is fine although the last few holes were a bit slower. It doesn't "walk" on you and makes nice, clean holes in the tile. Used a regular masonry beater to work through the rest of the brick at a time in our units. I drilled the crack using medium pressure for about 20 seconds, cooled the bit by cleaning it with a damp sponge, and then continued drilling. Each hole took a few minutes. Works well, will use it for the next rebuilds we have coming up.