I use the all Mattebox stuff with follow...but I find that in certain circunstances it is a bit overkill, thus my idea to find an independant and light follow focus. I'm used to both rotation as I use a variety of lenses that are different in that aspect. The fact that this system does not use rails etc...appeared to me worth a look. But the friction stuff instead of wheel is what putting me the doubt,
I think Mike K from this forum is using one that I remember now. I'll ask him.