I have done this to my RFM too. It does indeed make it look a lot better. Did you have to do the extra 5v mod? mine worked fine without having to do it.
I played both RFM at NLP, and the one that was in the lineup with the rest of the cabs ( not the one under Mypinballs hacking lab) seemed to have really spluttery audio during the explosions when you finish some of the modes. I dont know if it was just because the sound was cranked right up, and there was a lot of background noise from everything else around?