the higher the stage the more torque it can handle. a lot of people go stage 2 and that is more than enough for a stock ka but i figured hey why not go for more it was like 10 dollars difference and the pedal feels pretty good a little harsh to engage but not that bad.
edit- Yea stop and go is a bit of a pain i drive through nashville traffic all the time and its a bit of a bastard but really i don think its that bad.