We got the full main cast of Thundercats plus the new 'cats and some cool villains after the main 4. I'd say the Thundercats exclusives, both SDCC and NYCC were a huge success. I'm beyond happy that I have a great, complete set of Thundercats figures all in one scale.
The problem I see from recent years is when the exclusive is debuted at SDCC but then available at retail later, like the Spider-man Homecoming set. It was debuted at SDCC early and released at TRU.com so its poor sales performance at SDCC could be partially attributed to that. If its not solely exclusive, only sold AT the show, then its not as collectible as an exclusive. TRU was doing that a lot with their SDCC exclusives, not just Minimates but most of their "Comicon Exclusives" were sold by Entertainment Earth at the show first then online on TRU.com and in stores later. Thus diluting the exclusivity.