[Lionheart]

The existence of 'Rock Lords' always reminds me of the scene in 'Big' where the Tom Hanks character complains to the marketing executive about a transforming toy that transforms into a skyskraper... "But it's a building. It doesn't do anything."

Marketing Executive:

"I've got it! Robots that transform into.. rocks! The most INANIMATE of objects! Can't you picture it? 'Ho Brikkee - the evil forces of Volkanus approach - I shall transform into a rock so you can throw me... or just leave me where I am so they walk past - whichever suits you best!'"

Boss:

"If this were Hasbro or Takara and we were talking about Transformers. You'd be clearing out your desk by now. But since this is Tonka / Bandai and these are Go-Bots spinoffs, I'll just say... great idea. My god. We really are desperate."

Having said that... I loved them as a kid, so the power of toy + transformation + simple characters + cartoon + youthful acceptance will always win out in the end!