42% offer a smaller unit and not so complex as the smart-fly / fewer parts.
Good to have on gasser in case the throttle servo faults and goes full.
I actually lost a exhaust bolt and the unit came loose which in turn produced
a higher idle due to no back pressure. Everytime I set up to land to hot.
3rd time charm cut the ignition on final and brought it home. Don'nt fly without
one....