Cessna rtf weights 350gr (12.3oz) and has 14 sqdm (~220sq inches)
So with engine off glides as sailplane.
I use flaps to make rapid descent with noose pointed a bit down, with very gentle relese of elevator before touch down.
In powered flight with flaps you se plane in horizontal flight being pulled upwards (like kids hellium balloon)!
Advantage having sure start is that you have proportional flaps.
Real advantage of flaps on this plane is fun factor!
There is no dramatical change in speed, but lift shows significant change.