Yes, they are wonderful, though I give the slight edge to the second one, "Trio '81". I got the last copy of that from Dusty Groove, years ago.
The two of them, plus Ron Carter's "Third Plane" is the complete output of that group as a trio, correct?
Not aware of any others (trio-dates only) under Herbie's or Ron's name, nor any under Tony's (correct?)
Right, just those three. The "Herbie Hancock Trio" (SRCS 7051-had to look on the shelf) is the second half of the "Third Plane" session, I believe licensed to Sony for release under Herbie's name. Ethan Iverson did a write up on these and I don't agree with him, he finds that and the '81 trio session, aren't that great. They are important just to have Herbie in a trio.