Advice on Upgrade

I currently have a YS640s and just bought a YS640 made on May 15, 2015. It was an amazing deal at $500 including a Yoder heat blanket, cover and searing grates. It is immaculate. I know, that's a once in a lifetime buy.
My question is, is it worth upgrading the controller, ignitor and or the high flow burn grate? Will I notice a difference in performance?
I thought I would ask and save some time of comparing myself. I am sure someone here knows if I should leave well enough alone or make some changes.
My question is, is it worth upgrading the controller, ignitor and or the high flow burn grate? Will I notice a difference in performance?
I thought I would ask and save some time of comparing myself. I am sure someone here knows if I should leave well enough alone or make some changes.