I finally got to these today. Love them.
I'm surprised (not sure why) at just how gutsy they both sound, compared to Mokujiki or other Japanese records at the time by artists who I know better like Abe or Togashi.
Also, Yamashita seems, to my ears, to have quite an original piano style - less like Cecil Taylor and Don Pullen and closer to classic energy music type as played on the saxophone. That might just be me, though.