I tested a batch of my Reaper Bones bonanza of figures, here are 12 goblins:
They are not bad, the sculpts have lots of character, perhaps a bit less sharp in detail than metal, as you would expect with a polymer casting, but they take paint well. They are cast in a rubbery plastic that apparently does not require priming. I coated mine with Vallejo sepia wash prior to painting to bring out the detail. Worked perfectly.
and Lights (use of ahistorical green was intentional to key them as lights for CCA)