I was also intrigued by comments above about Herron sounding better through a SUT. I actually do have a very nice Rothwell MCL SUT (1:20) with Lundahl transformers which contributed very much in a better sound in my system, so I guess I think highly of transformers (ModWright again, although in another thread was mentioned that the 9.0 does not use one of Lundahl's best models).
And price-wise, a second-hand Herron is about $ 2800 shipped to Europe (where I live) vs 3400 for a brand new ModWright 9.0 and 3900 for a demo 9.0X upgraded unit. And cost is of course a factor...
To give a bit of a context, currently the SUT is fed by an Ortofon MC Windfeld cartridge mounted on a carbon fibre Pro-ject 9CC Evo tonearm on a Pro-ject Xtension 9 Evolution turntable (current phono stage: Project Phono Box RS).
My setup sounds quite good, it's well balanced and I don't have any real complaints. But, of course, I wonder what may I be missing compared to a higher end phono pre ! My amp and speakers are also quite good, revealing (detailed & transparent), tonally correct and natural-sounding, without being warm or lean/harsh (30 Watt Class A Tube integrated Audiomat Aria amplifier driving 2.5-way JMR Cantabile Suprême transmission line floorstander speakers).