AdmiralDonut :
Just going to reiterate Blackbirds answer. Better temps, quieter operation. Keeping the temps lower will extend the lifetime of the CPU, which is always a good thing.
Im pretty sure that CPU will last longer than its useful life even on stock fan.
Old desktops with P3's and P4's with stock heatsinks are still working today, its just they don't have a practical use in todays modern applications