How do these scale with a certain workshop's models? They look exactly the same style.
They're 1/72 rather than 28mm (or even 25mm), so they're not compatible. But they are a great size for games with 'old school' 25mm basing - DBA, HOTT, ADLG, etc, etc. These ones are on 60mm HOTT frontages (which should give you an idea of the scale):
https://1.bp.blogspot.com/-pCgficvgup4/Xz1dIm2ck1I/AAAAAAAABvU/txQYqyr-5IMIECcCJ42vYSrAODyiTeC4ACLcBGAsYHQ/w512-h384/Spears%2B1.JPGAnd these are based on pennies - and they would work as small orcs, kobolds, etc., in RPGs and skirmish games:

The trolls
are compatible with 28mm (the one here is with 1/72 Dark Alliance goblins), though I imagine they're quite a bit smaller than GW 28mm versions:

My biggest concern would be the plastic looks cheap. But I suppose if you're paying 20p a mini you're getting a decent deal even in crappy plastic. Pick up 2 boxes of these and a commander and you've got yourself a decent oathmark, kings of war or even warhammer fantasy army. 84 models can go a long way.
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Exactly! I'm currently basing up swathes of them for Kings of War (and adding some individually and dual-based ones to allow my HOTT elements to be used in that game).
The Dark Alliance stuff is shinier and (slightly harder to paint than the Caesar stuff (Caesar being the Taiwanese company that's the other great source of fantasy 1/72 - Caesar orcs shown with DA half-orc pikemen below), but it is more rigid, so the weapons don't tend to bend unduly. The Caesar stuff is more rubbery - like the original Reaper Bones material, so it takes paint and superglue very well, but you do tend to get bendy weapons (and sometime ankles) unless you replace them with hard plastic or wire equivalents.

The quality of some of the recent Dark Alliance sets - minotaurs and Anubis types - has been superb - little or no flash and no mouldlines to speak of. Those would work as smallish beastmen in 28mm (e.g. GW Ungors), as they're both quite hefty in 1/72. Both sets are really nice, concept-wise. And the cyclopes are the size of largish 28mm ogres.
Great company - and for reasons quite apart from their products, I'm sure we all hope that they're soon able to return to doing business.