Forge World is also notorious for doing a poor casting job, so it's not only expensive resin, it's expensive poorly-made resin. I would much rather invest in the excellent metal Bederken Dwergs, or even the Mantic plastic not-Chaos Dwarves than bother with these.
They're equally notorious for great customer service, and getting replacements out. I've not had any poor castings before, though I have heard of such things - mainly with the bigger stuff (which is worse)