They were clearcoated from the factory so I would not be to concerned.
Besides, FAST is much better than sluggish. Your reactions will compensate pretty quickly too.
Not to mention the vast cosmetic & longevity improvement.
And you can always lower the machine's inclination to slow things down if neccessary.
I agree. I'd rather have a faster game WITH the advantage of permanent protection of the playfield. I think it is a great idea for a keeper pin. You can always "slow down" the game with black rubbers, but they tend to make the game look crap. I much prefer white rubbers.