I recently did a week's test with the Orchard Audio Starkrimson amp with upgraded caps and power supply ($3500 retail).
I really liked it ! The headline is speed and microdynamics as if to reveal notes and timing in the music that were probably hidden with previous amplifiers.
Tonally neutral and overtly smooth, there is no warmth yet it's clean enough not to matter. Midrange presence and transparency are a bit lacking compared to other amplifiers in its class but these are minor issues.
I totally competent powerful amp in a very friendly package.