I run a pair of ML 334s, in vertical bi-amp configuration.
I have heard more than one solid state McIntosh amp, and they both sounded fine. I'm not a good one for hearing differences between high-end amps, perhaps because I don't believe there is much in the way of audible differences. My bias against the autoformers is only that I believe investing in robust power supply and output stages results in a better amp for many modern multi-driver, passive crossover speakers with low impedance dips than investing in a big hulking matching transformer. If you like McIntoshs, cool.