I assume you are talking about the behavior "Move Toward Mouse"?
If so, there are two key differences in my Behavior versus that one:
1) "Mouse Follow" puts a bit of "lag" on the animation so that it has a "catch-up effect" (it slows down as it reaches the destination, the mouse cursor). "Move Toward Mouse" uses a constant speed.
2) "Mouse Toward Mouse" rotates the Actor; "Mouse Follow" does not.
Perhaps I need a better name to make the difference clear?
Anyways, I built this for a game prototype I'm making - I didn't set out specifically to create this behavior. I figure it's better to share than to keep all the code locked away in the archives, right?