I have all three of those mention, space case, slx and santa cruz. I like the slx the best because nothing sticks to it. Other people have worried about the coating coming off, but I've used mine a lot and never noticed even a dink in it. Next is space case, which also does really well with sticky stuff but not as good as slx. Santa cruz is one of the top tier other ones, but not enough for me to compare to the other two.
BTW with any grinder you have the control...if you want more grind turn it upside down so the chunks don't fall through so you can grind it more. If you want less, then like Econ said just do one turn, etc.
MV1 works well with medium grind IMO, needs some larger chunks in there because of the convection like someone said.