Let’s start with facts like the stereo amp is well under 100K not 250K. The mono amps are ridiculously expensive but it’s limited production and overkill for most systems.
As for the preamp it is very expensive but also has a great phono stage internally so no need for cable either to sep phono preamp. ...and runs off battery so don't need pricey power cable.
And until the untimely death of Jonathan tinn the US distributor many units were sold by him to loyal customers at a significant discount off MSRP if you were not filthy rich.
As for the sound of the amp it really nails the midrange and brings out more soul than most SS amps. If paired with dartzeel preamp and a speaker which is efficient or has a powered woofer it is remarkable and was far more musical than my pass labs 260.8 monoblocks [which were good and a lot cheaper but not same league]. Even my EAR 890 monoblocks bested the Pass. Again pass gets you 85 percent there and much cheaper but for transparency and emotional involvement dartzeel takes you further.
Bottom line for me is tube amps especially EAR gets you emotional connection to essence of the music at a far more friendly price point but the dartzeel is remarkable for solid state albeit pricey.