It's been a long time since I did one, on a 4" and there was no doubt that it needed one and really made an improvement. It's fine to brag on a Smith and I sure bragged on my GP, before I sold it to a buddy who still enjoys it.
Now then, is you do a historical search on these, you will find a real expert by the name of GP100man. Can't say how many he has done .....
Be Safe !!!