In spite of the modest success of the show in the United States, the show was a massive hit in Mexico, Chile, Peru, Venezuela and Argentina, where it is recognized as one of the most famous Hanna Barbera characters ever, being as popular as The Flintstones.
Besides Top Cat, all the other characters from the show were famous, and their popularity is commonly attributed by the excellent dubbing and voice acting
I use 3: RedReader, Stealth & Relay