I have them since 3 years. Could’t be happier.
I had integrated AB before but never monos, so cannot do comparisons. They are quick and have plenty of power, able to sound easy and relaxed (tube-like) and never edged or bright.
i use to feed them to a P20 regens, other system all PS Audio, Innuos for digital and Gold Note TT, Sonus faber speakers.