I'm sorry but those sizes seem way off to me. Having seen Ground Gosei Great, Kanzen Gokaioh, G12, and Samurai Ha-Oh in person I can tell you they are nowhere near the size of an ultra class transformer. Maybe a large deluxe but I'd say that's the extent of it.

My G12 mini-pla is pretty big, so is the Ha-Oh. The G12 is about as tall as MP Grimlock's Dino mode.

I'm not a particularly big fan of the Siren Builder (it was by far the weakest mecha in Boukenger imo), but this kit looks great. May have to consider picking this one up.

I would love to get into these candy toys, the look much better than the Transformers Kabaya kits i am used to.

I have Enginoh G12 and Samurai Haoh and pretty sure they're bigger than Voyagers (I cant really get them out and combine them just for a comparison, sadly). Btw Ground Gosei Great and Kanzen Gokaioh are pretty small compared to Engineoh G12 and Samurai Haoh. I dont think they really grow that much bigger compared to their basic robos. Engineoh and Samurai Haoh both get SEVER boot upgrades ANd stuff added that goes above their head levels.

Yeh they ARE better. Actually GOOD articulation, great detailing and at least the size is good enough to mess around with.

I don't think I've ever bought an ultra class transformer to compare with but minipla G12 is much bigger than a deluxe. He's near double the size of GokaiOh and that's roughly the height of a deluxe Transformer on its own.

Still not Ultra sized. Maybe Ha-Oh

Yeh. I'd say the recent 'basic robot' (ie Gokaioh and Shinkenoh) come out to roughly the size of a deluxe. Engineoh and Shinkenoh's final forms are there abouts double the height so they ARE pretty big. I having really compared them so I dont know how they really compare to Ultra class toys but I'd say pretty close.

Edit:

Not my own pic but that looks pretty big (I dont have City Commander so not sure how much height that adds to the Voyager Prime mold).

http://img833.imageshack.us/img833/5900/img2874k.jpg

It's worth noting that the candy toy also has some forward and backward leg motion; only by moving both at once, mind you. Backward isn't that useful, but it still allows you to get a few nice poses out of it. The sides of the feet still flip out to look like support stakes that would secure it into the ground while firing or whatever. There's some head motion too.

Also, gallery should probably be updated with a pic of Mixer and Crane attached to the feet for Ultimate SirenBuilder, something I believe only the candy toy can do. Here's hoping for a Zubaan gallery in the future, that thing's probably my favorite minipla.