I love them, and I use Black Gaine pretty frequently. He's a good seller, and his combined shipping means that even getting these over to the UK they're still cheap as chips. The only thing to watch out for with these KOs is that there are two kinds. The larger kits (they're still small compared to the proper toys) come on three sprues, each in a different colour. I've never had a problem with the casting quality on these and the plastic is up to scratch. If you're wanting one of these larger kits then I'd definitely say go KO rather than the $50+ that an original 80s Kabaya in an unassembled state will set you back (asuming that you can find the damned things). The other kind are the smaller kits. Minibots, some of the tapes (not Ravage and Rumble/Frenzy, those two come together as one of the larger kits) and the (roughly) WST scaled kits that come on a single sprue, so one colour, are best avoided. There's moulding imperfections with most of the smaller ones and they're made using a soft, shiny plastic that's a bitch to work with.
I've got my Galvatron in pieces at the moment since I'm in the process of painting him, but don't have any finished ones that I can show you as yet. If you want I can post some size comparison pictures of some unpainted ones to give you an idea of just how big the finished article comes out.
You've reminded me actually, I'll need to be placing another order before too long. The Lio Kaiser kit has just come back into stock and I want a second one to display as individual bots in front of the gestalt. That kit fits in with the WSTs beatifully and unlike the ready built WST LK KO actually has all the right bots rather than replacing one of the jets with a second drill tank.
edit - And here's the comparison shots.
Victory Leo and Victory Sabre (I havn't picked up the Star Sabre kit as yet).

Dreadwind, Darkwing, Hi-Test and Throttle (yes, those powermasters are tiny) these will combine into Dreadwing.

Rodimus Prime with some of the smaller kits, Beachcomber, Tailgate, Powerglide, Seaspray and Steeljaw. Powerglide in particular is a problamatic kit, with all the trimming in the world those arms will never go on properly.

Cassetticons! The Condor mould is another problamtic one. Interesting thing with these is that the cassette mode details are moulded on rather than the stickers on the proper toys.

Trypticon with the (roughly) WST sized Dreadwind, Darkwing, Flywheels, Battletrap, Cutthroat and Rippersnapper(no powermasters or combining abilities in this scale).

Galvatron, Scorponok (no headmaster ability) and Metroplex. These two cityformers can do their mobile alt modes but only an approximation of their static city modes.

Breastforce, and transformed.

