Very nice. I went through phase of trying several Class D heads, TC RH450 & 750, Aguilar TH500, GB Shuttle 9.2, Darkglass M900 and the GK MB Fusion. I kept the GK way longer than I kept any of the others. To my (admittedly cloth) ears, GK amps have a really good core tone. I only changed it as I fancied going back to something heavyweight while I still could. Congrats on the new amp!