I am not mechanically inclined, so I had a professional mechanic install this for me. (costs a bit more, but I have the guarantee that it was installed properly) Missed shifts are now a rarity with my bike. And shifting now feels more like pressing a button in an arcade game than trying to shift heavy, slow gears. The stiffer spring and modified shift star will result in less movement required to shift gears. Meaning quicker shift times. That's always a plus!