Sorry to dive in again, but my experiences with the R and RS preamp models is that they NEVER tell you how 'revealing' they are (the stock one gives all the detail there is in a given recording anyway I think). What these expensive refinements do is allow the circuit to operate more effectively and this is heard in the easier way it is to 'perceive' this detail in the playing and things going on far back in the mix. The SOUND doesn't really change at all. In fact, the RS needed a few minutes to 'creep up' on me when I first heard it, but the huge cheesy grin on my face subsequently spoke volumes.
Tear down these walls; Cut the ties that held me
Crying out at the top of my voice; Tell me now if you can hear me