Have you ever changed a club and seen immediate results?

1st time I used a 2 ball putter (when they first came out) I couldn't miss the hole and had my first ever under par gross round. That stayed in my bag for over 10 years.

One of the truly revolutionary new golf clubs to hit the market is the last couple of decades or so, I would say.

Still in the garage just in case. All the other clubs that I replace get sold on.
 
More then anything it was getting the right length driver for me and not the OEMs length. But recently it's been my new Raa Classic that I've got that's given me immediate results.
 
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