I always liked this show because of the classic voice talenes. You had June Foray (Rocky, Natasha, etc.) as Grammi, she played that part perfectly. Paul Winchell (Dick Dastardly, Tigger, etc.) as Zummi as well as Bill Scott (Bullwinkle), who played Gruffi, before he died.
But my favorite is Lorenzo Music. Tummi Gummi fits him like a glove. And for the last two seasons on Saturday mornings, he was on another network (CBS) voicing a feline named Garfield.
Little trivia; When NBC had Breakfast at Wimbledon, Gummi Bears dethroned The Smurfs of their exemption pre-emption (The Smurfs was the only cartoon to air before Breakfast at Wimbledon came on in 1982, 1983 & 1984, believe it or not.).