I used to use it for my ball python. Now I don't, I use aspen, though honestly the Ball Python I think could care less about what substrate is in his viv lol.
What I found is it was holding liquid and smell... I was having to wash it weekly, which was okay I had two pieces and would wash one and use the other, but even then it was starting to smell. It looks nice though...
I find aspen way easier to spot clean and my king LOVES the aspen.
T