I've got Fort Max, Superion, Defensor, Devastator, Bruticus and Menasor. They're okay as boosters for the WST line but nothing all that special quality wise. The joints on the gestalts are a bit tighter than some of the larger KO versions which helps, although my Max is a bit floppy. The Scramble style combiners don't have fully interchangable limbs, the arms can only be arms and the legs can only be legs. While the limb-bots are a goodish match for WSTs the torsobots tower over them, but this is far less of a problem if you plan on keeping them in combined mode. As with other KO versions of the Stunticons a couple of the cars are replaced by random Technobots. The labels are of the "cheap and likely to come off" variety and are usually poorly applied, I've removed them from all of mine except Defensor and I'll probably take those off at some stage (kind of regret removing the purple stripes from Motormaster's truck mode though). The Liokaiser I've avoided because it replaces one of the jet arms with some sort of tank, I've gone with a KO Kabaya Liokaiser to go with my WSTs instead.
They're far from perfect but do make good boosters for a line that died too young. If you're planning on playing with them a lot then they're not the greatest thing in the world, if you just want to display them alongside the WSTs then you should probably go for it.
Reprolabels have done a set at this size for Superion, so other reduced size sets for these KOs may well be forthcoming somewhere down the line, which would add to their asthetic value considerably. Hope that's of some help.
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