Any of you guys used this lure? Is it similar in action of a scatter rap? 

I've used it but I haven't used the shallow scatter rap to compare it. The baby fat john works like a very shallow wide wobble crank that has a hunting action that's similar to the scatter rap but not as exaggerated, its more like a wide wobble with the occasional dart left or right. I really like the lure myself, it has a nice compact size and a great running depth. Its not quite a wake bait but its still very shallow running, probably 2ft. Great for running over heavy cover or in the backs of shallow coves.