Just finished my build of a new Stereomour II, replacing my original S.E.X. monoblocks and original Foreplay preamp. Happy to say that the amp checked out and worked from the first power up. Great directions- could do with some larger or higher res images in the manual though. I'm feeding it with a Meridian Explorer2 DAC out of my Macbook Pro. The speakers are my historic original ProAc Tablets which are now probably 25 years old. I've found the ProAcs are not extremely efficient, but they present a nice load to a tube amp, so as the amp goes to its power limits, the sound stays well behaved.
I can hear that the amp is still settling in during its first few hours, but the sound is really impressive. Its sharp, clear, quiet and balanced across the frequency spectrum. Very revealing through these little mini-monitors in a near-field desktop setting. Definitely not a "tube" sound. I can hear way into the mix and the imagining is really sharp with some nice 3-D depth to the sound.
I guess the old amps will go back on the shelf for now. They played a bit louder than the Stereomour but there's really no comparison as to sound.