is they a big different with avcs on
 

I have a r30 with s148 all around and a gy240. My heli fly around the field with no problem in fast forward flight, the tail does not wobble and the avcs on the gyro is turn off. What can I really gain by turning it on and adding a better tail servo. I am thinking of the new jr sport digital servo for $50 or the hitec 5625 digital for $55.