Pa 28s are cool , quadrant throttle, low wing, rudder trim and all the diffs the above posters have mentioned which are all very valid.
But the coolest thing about the pa 28 is the manual flap lever. Electric flap is so naff and slow. It's the only aircraft where you can really show the effect of flap. Chunking the flap in shows that attitude change immediately. Electric flap is so slow the attitude changes kind of morph.
The best fun is demonstrating full flap to zero flap retraction in one go at go around speed ( at a suitable height). That will peel the skin back from your eyes and make you understand why you retract flap gradually.
Great training aeroplane.