Futaba states that the S9551 "FEATURES: Digitally enhanced microprocessor cuts about half of the response time from transmitter input to servo reaction"
Half of the response time from what, an analog servo?
I run my 4PKS-R and R614FS or R614FF-E on all my m-chassis... would I be able to feel a difference between my S6070 and SC1252MG if I got a S9551?

really?
BTW, I run S9452's on my V2 and M05. I honestly can't say they are any better than my S6070's or SC1252MG?