I have a EVS 1200 dual mono amp, based on the same IcePower modules in PS Audio's M1200 mono amps: PS Audio modules are stock with in-house designed tube inputs. According to a review by Michael Fremer, they were so good that he bought them. My EVS was marketed a good 9-12 months before PS's M1200s. EVS highly tweaked the modules wherever possible. I raved about mine and had a big following in AG forums some 2 years ago, but when I received my LSA Voyager 350 GaN amp, the top to bottom improvement was literally night and day.
AFAIK, the GaN modules have been very hard to come by of late, which will likely hinder progress toward integrateds
hth