Those pictures are great JJ thanks for the review.
Here's my minireview, which is my opinion only, with both pros and cons.
My one picture (5-in-1) for this minireview:

I was actually surprised by how closely the look does match the eFx Limited, in size, shape, and paint.
It's a recommended buy from me to those who don't own an authentic cast ANH and are looking for a low cost "reference helmet." That is, a helmet which provides an accurate representation of the features and characteristics that uniquely define and distinguish the ANH variant from all others.
But I don't consider this helmet out-of-the-box to be a completely authentic casting or even suitable for trooping as-is. I say this only after evaluating the product first hand.
Some compromises did have to be made to facilitate PCR manufacturing in the design of the tubes for example. And I also notice that areas within the breath mask are not consistent with what an authentic casting would look like. The bottom of the grill teeth for example follow along a completely straight line. And the teeth themselves are completely flat.
It is certainly possible to create sturdy troopable helmets with ABS or other types of plastic if it's made to the appropriate thickness for the plastic and for the helmet design.
But when I pick up this helmet like I would any other Vader helmet, by the bottom of the mask, I feel it start to give and deflect by about half an inch under the its own weight of the helmet. The plastic is far too thin there to support the kind of stresses at that location. From putting the mask on, taking it off, and handling it. I could easily see this thing cracking while trooping if somebody simply bumped into you while you were holding it from the bottom.
It wouldn't be too hard to reinforce it but it's something that needs to be done, to avoid creating a crack that would be difficult to seamlessly repair. The ANOVOS OT Stormtrooper helmets commonly need similar reinforcement along the bottom where the plastic on those can be quite thin.
And one last thing the original helmets I don't think made scraping, creaking, and popping noises when handling them. This comes from the 4 tubes, which are separate parts, the noise caused from the friction of the tubes rubbing against the mask.
"Where are those
(squeak squeak)
transmissions you intercepted
(scrape pop squeak)!?!"
So knowing this up front and bearing this in mind, if it isn't going to bother you, this is a great helmet with an accurate look for the price when made a bit sturdier will make a fine ANH helmet.