About a year ago, I purchased an INT-60 and drove one of the not-easy speakers (Sonus Faber Electa Amator v.1) with 4 ohms and not a pair of high-sensitive speakers. It has been doing great, and I enjoy the music coming out. With the meter on INT-60, it hardly gets into the AB zone until I play music with a lot of bass and loud.
Build quality is as good as my old ML #20.