When I bought my Pro it came with mirror blades and a few other mods. I love how the blades look because the reflect a lot of light from the playfield and make it feel a bit more expansive too. I've added so many more mods to it on my own, I've almost lost track.
I put some SuperBands flipper and post rubbers in almost as soon as I got it, and they definitely bounce the ball around a lot more. I also recently did a little cleanup of the playfield with some Novus (just the parts I could get to without removing the ramps, etc.) and put in some high gloss pinballs from PinballLife.com and now the game is almost TOO fast. The balls get a lot of spin going on them now too. I'm wondering if I overdid it with, either the cleaning, and/or the new pinballs. I love the look of the high gloss pinballs though as they just glow with all the reflection coming off them. But sometimes the things move so fast I can't even see them, haha!