Don't like being a killjoy, but I've never had as high a regard for this session as most others who have written about it on this thread.
Don Sleet's playing has its moments, but too often he falls back on Miles-isms, or his facility wins out over the feel of the music.
The other musicians on the date, with the exception of Wynton Kelly, sound somewhat disinterested. It may have been a group that came together in the studio for the first time. I find Jimmy Heath's playing particularly disappointing. Someone else has commented on the poor quality of Ron Carter's arco playing. Someone at the session should have taken his bow and broken it in two - only halfway serious about that.
Don Sleet's playing certainly had potential. Who knows what might have happened if he had stuck with the music?
To my ears, All Members isn't a bad record, but it's not really a good one either.