I like big models. Also, I greatly admire Games Workshop when they manage to create two distinctly different models combined with the same kit.
However, in most (if not all) cases, there's an obvious "main" option, with a nifty alternate version. In the most successful cases, this isn't that noticeable (Tomb King Sphinxes, Vampire Counts Throne/Engine). Unfortunately, it often makes for a poor alternate model (Doomsday Ark), and in the worst cases, so many compromises has to be made, neither option comes out fully successful (Skaven Cannon/Catapult, Ghorgon/Cygor).
However, I feel the dual kit concept has reached a new nadir with the Tervigon/Tyrannofex. The Tervigon itself is pretty sweet, and I thought the Tyrannofex was allright as well, until I read the latest WD at work today (). The Tyrannofex has two defining characteristics: It uses all six limbs for support, and its gun is fused with its torso. And the model caputures exactly none, instead looking like a ham-fisted Tervigon holding a gun. Also, as a side note, for something supposed to be so massive, the huge negative space under its body, where the Tervigon eggsacs go, does it no favours. And the middle legs looks weird.
I'm just thinking maybe they're pushing the dual kit thing too far. At least most times they compromise a little, but here it's like they disregarded the concept of the Codex entry to cut corners. Games Workshop has always claimed to make games to support its models, rather than the other way around, but this makes me wonder. And it's clearly a step in the wrong direction.