>>11246057I don't have any of the middle size (I think that's the line you're talking about), but I do have this Hedorah from the Artistic Monster Collection line. It's a lot bigger but like you said it's just the arms that move (and technically you can remove/rotate the smokestack, but that doesn't really count).
I'm happy with mine, but I will say I got it on sale for 9000¥. Might not be worth it at full price. I love how this one looks in particular, but I haven't been impressed with most of the pictures of others I've seen. I would post a picture of mine, but I'm away visiting family for the week.