I have heard some things about the benifits of replacing the bridge on MIM Fenders. My questions is, what would justify purchasing a new bridge? Would you switch a bridge just because it is heavier duty, it wont move. Do most people switch bridges for the sound, or just mechanics. I have a fender jazz MIM and was noticing the was a little buzz from the bridge, I also dont like the saddles moving around and such. I think I can put up with those problems, but if it did anything as far as making the MIM sound like a more expensive bass to my ears rather than my eyes Ii would consider the purchase. Any info or experience would be helpful, Thanks.