Measurements/Scale
The helmet with the pads in is really snug. I'm 6' 2", and have a fairly large head, and wearing it with the side pads is not comfortable for long. Remove the side pads, and it slides on easily. It seems that when I wear it, the mandibles on the helmet line up right where they should. I don't have any way of knowing for sure, but my guess is this helmet is very close in size to the real thing.
To give an idea of how it stacks up, i'm using my Black Series Kylo Ren (modded by the great Richard Campbell) and my Anovos First Order Stormtrooper helmet. The Poe helmet should be slightly smaller than Kylo Ren's in over all size, but much smaller than the Stormtrooper. I think these pictures show that it looks fairly accurate in scale.
The Force Awakens, or The Last Jedi?
So this is the interesting part. When I got the helmet, I was prepared to do a full overhaul of the interior and paint it black. Poe's helmet in TFA has a black interior. I was curious why Hasbro would go with a tan interior for this helmet, but now that I have it, I'm convinced it's based on The Last Jedi version. If you look at the picture below of the upcoming Anovos helmet, the logo on the ear opposite the rebel symbol only as a tan line around the circle, and not the swirly thing above it. Also, the circular button at the top of the visor is also gray. This color scheme is confirmed by the film. The screenshot from the movie below shows the Anovos is accurate.
Looking at the Black Series helmet, the visor has a Black button at the top, and the swirly bit above the circle also has a tan line around it. This is different from the TFA helmet. I thought this was just another thing I would have to paint, but then I looked that the leaked toy box art closely. You can see that the helmets match, basically confirming that this helmet is in fact based on The Last Jedi, and not The Force Awakens. I have yet to get a good look, but I'd be willing to bet the interior on the helmet from The Last Jedi will be tan, not black.
Verdict
For the money, this is an amazing helmet. Given the assumed price point of $80, It's almost too good to pass up. The re-paint possibilities alone are reason enough to pick it up. Looking at this, and what my Kylo Ren Black Series looked like out of the box, the Poe helmet is hands down the better helmet. It seems far more accurate, and will need much less customization to make it look fantastic. While not perfect, and probably not as good at the Anovos will be, I feel that this helmet will still look great on the shelf. As someone that has a mix of high end, fan made, and retail helmets, this one is definitely a step in the right direction for Hasbro.
If anyone as any questions, or would like additional pictures, please feel free to let me know. I will attempt to capture the sound, but It'll probably take a couple of days so please bare with me.