i think all(well most) hot toys figures should have PERS as long as its done right and doesnt add to the price.
I disagree for a few reasons. One, as has been mentioned, so far the eye openings have been pretty open to maximize use of the feature, but someone like Arnie should have a squinted look. If HT gives all PERS heads a more open eye look, some won't look so good.
My other reason is, while I haven't had a problem yet, PERS is a mechanism and can therefore break and if it does, the head is pretty much worthless.
There are characters or looks where PERS can really add value, and others where, to me, the feature doesn't add enough to warrant adding a fuction to a key piece of the figure that can break and ruin it.