The PS 300 Tube circuit

Hi, I bought the PS 300 replacement circuit for tube equipment, I somehow hesitate to make the change because I have such a good sound to begin with. Do you have any feedback from such a changeover?
I installed the upgrade; can't say I was bowled over by it.
Fantastic change after the Multiwave II upgrade! Go for it and trust your ears!
Good luck!
Thank you for the answers, I know most people are busy earning the dough to buy more of such gadgets but if you could spare 5 more minutes I would appreciate any amount of elaboration on how the new circuit improved your sound.
Thank you,