Hellfire didn't flop or fail because of design exactly. Your avg racer wants someone to tell them how to set it up and have that "factroy driver" behind it. Hpi didn't do that so what that don't mean it flop or was disliked like you said. R/C world right now is like the Auto industry was in the 60's win on Sunday sell on Monday. Have factroy supported driver and run big ads in every magazine and website. Hpi kind of over built the truggy since it's so stiff with very little chassis flex.
PBS still suck been there done that. Give me C-hub or Hellfire style front suspension like Xray, Losi, Hot bodies use right now