I have been thoroughly impressed by their product line and I will be taking some things from them to AXPONA with me. TBD exactly what.
You can expect a neutral to slightly warm sound with tons of power. Despite being warm, there is not a lack of detail and unlike some warmer amps, bass is well controlled. It should be a little less sweet than the 8.3s but that is driven by the lack of a tube input stage more than anything.
It will be much more neutral than Bryston, Krell or Chord and you should expect a sound profile closer to Pass or Accuphase.
I am rotating through as many products as possible and will be bringing in either an SA6.3 or A6.2ME after I sell my A5.2.
I have not heard the Gamut electronics and cannot offer a point of comparison.