I went from a DNA 125 to a pair of Quicksilver Mid Monos. The McCormack was a great amp , it was my first solid state in years. Prior to that I had several decent tube amps.
I have used the Mid monos with PSB Platinum M2 , Revel 106, Heresy, Forte, Sonus Faber Concerto and a few others.
Mine were built in 13, I bought them when they were 1.5 years old. They have seen continuous duty up until fall of 22 when I bought a 300b. I'll rotate my amps occasionally,
I have them in my system now and they sound great with fresh EL34. I also have late 50s RCA 12ax7 input and JJ 6922 drivers in them
They can use almost any el34 and 6l6 variant. KT88, 77,66, and others. Can "sound" how ever you like.
Hard to beat new for the money , steal used.