Personally, I'd go with IMAX 2D over 3D....just because there's so much going on in several scenes that the #D could be really distracting.
Well I just tried the AMC imax. As of now I can't tell a difference between that and the AMC Dolby screen right next to it.
Does it seem like Vader's helmet does anything in this trilogy? I'm assuming Palpatine was telling us that he "showed the darkness" to Kylo in what was assumed to be Vader. Kylo touches the helmet to try and mess with Rey while she's running the training course, but I assume the result is nothing more than the dyad connecting them. I aways felt weird about the idea of the helmet having any dark energy given Vader redeemed himself. When people say that
Palpatine's return messes up Vader's sacrifice... I feel the helmet corrupting his grandson would have been exactly that. I don't agree that Palpatine returning affects Vader. Palpatine is an evil old **** and evil is as evil does. He returned in Dark empire and he returned here. If he had means to do so he would return.
I do like the idea of someone getting to surprise Palpatine twice only to have the second surprise backfire. The first surprise is the ability to transfer the saber from Rey to Ben. I appreciated the little slight of hand trick she does. The backfire surprise is that the life force of the two is enough to regenerate him, which it appears he did not anticipate.
Also, captain Sidon Ithano is present for the celebration at the end. He is listed in the visual dictionary but it wasn't clear to me that was the connection. I'm hoping his ship the Meson Martinet is visible somewhere. Wookiepedia also claims that Quiggold is in ROS or maybe on set at least.