I've never used one. Reduces recoil? Probably not. I'm not an armorer so I may need some help on this - the return spring is just that - it controls the amount of pressure needed to move the slide back to eject the used round and reload a new round.
The only ways I know to reduce recoil are -
1. Use a smaller caliber round.
2. Ported barrel.
3. Reload your own ammo and reduce the powder.