In flight, it's normal practise to rest your heels on the floor and apply rudder using your toes, this is to reduce the heavy foot forces and make your controls more sensitive. Unfortunately there is a lip on the bottom of the pedals which forces you to rest your entire foot on the pedal, combined with a heavy centering action means it's difficult to make the minute rudder inputs necessary to hold heading, it's awkward for co-ordinated turns. It is good for heavy footwork stuff, engine failures on multis, directional control on take off and also works well as a procedural trainer.
Just to clarify, light a/c are flown with rudder because the low momentum and short arm moment rudder give good responses. On heavies rudder isn't used because of sweep, oscillatory stability and cause it shakes the plane.