Probably a dumb question. What is the benefit of changing out your rear sets from stock?

 

well lets see

good quality aftermarket rearsets are machined better, shift smoother and are built stronger
they provide higher ground clearance which is great in the twisties
they also allow you to adjust the footpegs back/forth/higher/lower according to your preference
since they're made up of individual parts, they're also easier to fix in case you crash
last but not the least, they look 100x times better than the stock stuff

 

lets not forget that good rearsets also have fixed pegs
this serves two functions
when you are moving from side to side a stock rearsets pegs can move up with the boot which could throw your position off until you can recorrect

also the fixed peg will act as another frame slider in the event of a lowslide