I suppose it depends on what size of mill you are putting in.
Mine has an ASP180 F/S going in it.
I have fitted a new servo tray using a couple of high torque hitech digital sevos for the elevator & rudder.
I have dumped the original push rods for closed loop on the rudder.
The elevator halves have been joined with a carbon fibre rod & a more robust push rod fitted.

If I had not intended to do a smash on the airplane I would have been most disapointed with the kit (oh &amp; it was cheap!</p>