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And do they have models, or are they just kitbashes?

Edit: Link to their article.

They are a unit that I'd like to try at some point. Although I'd say they're a bit over-costed compared to regular Cataphractii, being priced closer to some of the legion terminator squad. They don't have official models so you'd need a box of cataphractii + bitz to convert them.

The unit itself does look like it'd have its uses. I do like the idea of a squad rolling up in a land raider and unloading 5 toxiferran flamers into a tactical squad camping an objective. Or give them disintegrators and go hunting legion termies/characters, but there are probably units that can do that for cheaper. The deflegrating power mauls are nice too. They seem like they'd be good at getting rid of those veteran/veteran adjacent units.

I have a unit of five. They're a really fun unit and very different. They often throw people off guard just because they're quite different.
I have a sarge with thunder hammer, 1 power fist, grenade harness, and 3 mauls. All armed with disintegrators.
They can threaten other terminator units and multiwound models like speeders and gal vorbak at range, and are decent against infantry in melee. They don't really want to be going against dreads unless you're feeling very lucky rolling sixes with the disintegrators