It's quite good but no comparison to the amp I use 90% of the time (the larger Carver M-1.0t MkII) and it doesn't matter the volume level I listen at. If I do actually get to play things a little louder, when everyone is gone, the more power comes in handy. I'm pretty sure if I ran either of the two tube amps on Belle's, La Scala's, Klipschorns, etc., that power would be sufficient and the larger amp overkill...and maybe noisy.
I did run one of them on some Khorns years ago and it did just fine. All I needed.