The good thing about quality Japanese equipment is the "feel" of the controls: silky smooth pots and a decisive feel for the switches.
Some American amplifiers have the same quality feel to their controls, but the Japanese did it first.
What I like about Yamaha kit of this period (and to some extent those of Akai and Nikko), is the "hewn from solid" look. Added to that the labelling is clear, and uses an unfussy font. (One thing I really dislike is the use of italic styles of font on audio gear.) The wooden case gives Yamaha gear a handsome look (the perfect example being the CT 7000 tuner, where all the little used controls are neatly hidden under a flap)