It has been hard for me to convince the trainees I help, to start slowing down during the downwind leg and let the plane have the proper sink rate using the throttle. When a pilot starts slowing after final turn and often too high, it's too late to bleed off speed. After the pilot moves to the low wing models and keeps the same habits, they wonder why the plane won't slow down.
Using the flaps and if for some reason have to abort landing, you have to be careful of sudden throttle up causing the plane to dive a bit. This can be expensive if you're too low and missed the runway and panic to make another pass.