To all in the know..

Wondering what kind of extra oommph is to be had by adding the 3 jetworks valves into the pipes...???

Is it quite a noticable improvement or only slighty better...???

What i'm thinking is why use 3..?? is there not some way to only use one before the water enters the waterbox..??
In a similar fashion to the single pipe arrangement..??

Or i am way of the mark here..????