I have never trimmed a clay as smooth as 563. The clay shaves off with no disruption to the piece, and I don’t get those nasty little grooves that some grogged stonewares do. I am liking more about it than I am hating about it. I will likely keep working with 563, maybe as a replacement to 105 as my normal throwing clay. I had no problems getting the wobbly bowl to trim to a beautiful foot.