Yes, but it is only for Goldberg completists. The two sacred pieces are not on the same level as J.S. Bach's pieces. If you are deeply into 18th century mid-German baroque church music, pretty much indispensable, if not, consider.
I saw one of those in the Vienna or Berlin instrument museum. Especially made for music for two pianos. There even was an earlier model by Stein combining a harpsichord with an early Viennese piano.
ROTF LMAO
The Sweden episode is well documented on these compilations:
https://www.freshsoundrecords.com/benny-bailey-albums/5332-in-sweden-1957-1959-sessions.html
https://www.freshsoundrecords.com/quincy-jones-harry-arnold-albums/4571-quincy-jones-harry-arnold-big-band-jazz.html