"Like the concept of having digital", "want to say the plane has digital", "think having digital would be neato", all legitimate reasons for buying digital servos for 99% of flyers. "Need digital" is for about 1%. (No scientific data to back up percentages). I put Hitech coreless analogue servos on my last plane, a Pitts Super Stinker, and I'm not good enough to tell the difference. When I let go of the elevator it flies level, so I assume they center just fine.