This is a pretty simple topic, but I find it still relevant. I've been loving the NECA releases lately, specifically their Predator series, though this topic doesn't apply only to them.
Specifically, I have an issue with NECA's articulation, in that they will sculpt fantastic looking figures, give them all kinds of articulation, and then render it moot by covering the figure in rubber that is either very stiff or only partially flexible. Some of the best looking Preds like Scarface or Ahab might as well not have ball joint hips when you look at the heavy skirting they use. This issue is not so much the thickness of the rubber, but the flexibility.
I absolutely love the Movie TMNT figures Gamestop has, but while they're fantastically deta...[
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Am I the only one furiously checking forms and customs groups for peoples rendition of Endgame Thor? in Action Figure Chatter by KabutoRyder 
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The recent NXT series of figures (came out last month) have done a better job though. Thin flexible jackets that don't limit movement and are easier to remove and put on without a ton of stress on the joints.