Just like Roger says. Tighter B, and a more Jazz like pop on the top end. Interestingly enough, it doesn't seen to effect the sound of the P pickup when solo'ed. It still has a very legit P bass sound. Definately worth the price of a new pickguard. I had ZERO problem with the way it sounded before but this puppy flat out rips now. If you own a PJ5 give it a try.