Yes, the resolution from cheap servos to name brand (savox, BK, even Align) is night and day. However, they may have good servos on it from the git-go.
And they may have dual elevator servos on that one, or, it would be a Y wire that is connected to a single servo. Usually if they are using two servos for the elevator, they will use a "pull/pull" setup on the rudder, but this one is a push/pull (single side).