Lucky you ....
40$ is a gift. Even though the spots and veins are not desirable for such stones. La Dressante is quite hard, better for tools
Then ask me
I've tried the major part of all known non- Japanese stones .
40$ is a price!! Mine cost much more . ..
Budget, yes, the only stones I actually have are cheap silicon carbide rough/medium and a very fine unknown-grit oil stone(said to be the finest sand