The same individuals who have attended the Phon' demi', have also built both Pass and Millet - Korg B1 or Korg Pre's.
A Pass Model using very high quality components, was a Pre' that won through at a Pre Amp' Bake off, where models in the line up, were between £1500 - £8K (from recollection). Not bad for a £300ish build. The intent on the day was to select a Pre' for a system where the £8K was not classed as a constraint to a purchase.
I also have a loan in my possession of a Balanced version of a Korg B1. This is being compared to Pre' designs that are turning up when I host a group meet up.
I really like how one pre' creates a soundstage that is so deep the horizon line is not discernible, another will add a few puffs into the Soundstage and create the perception of a more voluminous expanse, another will get you to the edge of the seat and have one picking out every detail. Where the Pre' really wins is showing how a certain design of Power Amp' can present the received signal from the Pre's and really allow them to be recognisable for their sonic influences. O would say today resulting from my experiences, every system deserves a second Pre' Option, especially a model that is quite a different impact on a Soundstage, not so much on the End Sound.