One truly needs to be prepared to hear the young and raw voice of Diana Ross to appreciate this set. The songs and arrangements are pretty green, as well.
For me, the great treats here are the lead performances of Florence Ballard, leading the silly and exhuberant "Buttered Popcorn" (an absolute delight), and Mary Wilson, robustly featured on the Berry Gordy-penned "Baby Don't Go." Both of these feature a very doo-wop, girl-group sound, the first being more straight-ahead rock and roll, the second, rock and soul "ballad" singing.
Since "Buttered Popcorn" has been featured on several anthologies (because it was actually The Supremes' second release), that leaves "Baby Don't Go" as the main reason to covet this collection.
However, in spite of the spare production values throughout most of this set, and the developing talents of the songwriters, arrangers, and the performers themselves, this is still a valuable, historical musical portrait of emerging greatness.