Having acquired some of the pendraken dwarf range, I will say that they're up there with GW, quality wise, really characterful sculpts with some nice detail, they're very reminiscent of older GW dwarfs to my eyes, much more big noses, leather jerkins and tabards as opposed to everything being made of metal and covered in runes and other viking imagery
The irregular minis dwarfs are not all that bad, although the batch I have suffers from quite a bit of flashing, they're more of a match size-wise to the larger pendraken sculpts than the eureka/copplestone/GW ones, and they are all basically the same models with a few details changed, I'll probably use them, but there are better options available for similar prices IMO
Eureka anvil dwarf minis are superb, really good quality and a perfect match for GW scale-wise, shame they're so expensive really!