Digital servos are programable. That is why they are more percise. HOWEVER it is not really your "average pilot" that tells the difference. It is your plane. putting digital servos in a trainer would be overkill. you would never notice the difference from digitals to standard ball bearing servos. If you had a jet, or an ultimate bipe or something slightly faster or more responsive, you just might. I was told not to put a 6v pack in my trainer, as it was a waste of money. I put one in my easy sport, however, and while the other pilots told me i would not notice a idfference, i did. not a huge one. But not a lot. I recently switched from standard servos in the wing of my cap 232 to coreless ones. I was astounded. It reacts a lot faster, and i am able to do things like rachet and 4 point rolls a lot better. It made me look a lot better than i am. Any warbird will have no use for digital servos. maybe your 1/4 scale edge 540T when flying toc.