I've got the Goji set and I've seen a couple very small "pock" marks. I think it probably shows up a lot more on the Hedorah because it's such a smooth sculpt - the Goji has all those texture gouges though so you don't really notice any imperfections.
Haven't heard any info so I'm guessing these aren't that popular. It turns out the zetton's and mecha gojis have been given the treatment. I think the mecha's turned out great.
Still waiting on my Mecha and Zetton sets. I think they all look incredible, I never see them in the secondary markets.
I'm pretty sure I saw a Godzilla set on the bay a few months ago that went for crazy cheap (less than 150$ for sure, maybe 100$).