Ben, just curious what is making you think that this is happening in your original NeoAir?
I don't really care if the pads are see through or not, although I am not so sure that many "insulated" air pads have been see-through up to this point (although I could be wrong on this).
What upsets me about the "X" pads though is that they are literally cutting corners to save weight, although I know that not everyone will share this preference. Me though, I like having a full rectangular cut, and at 13.8 oz for my regular size original NeoAir, it is well worth it! For the added comfort, I am fine carrying an extra 2 oz. Sleep is something that I "need" to enjoy while out, so I require a comfortable pad, and pillow. That's just me.
I agree with you though, in the cold, a pad is a critical piece of gear. However, I use a ccf pad as my pack frame, so I have back-up just as well.
Oh yeah...I also contacted TAR recently (asking why would they want to quit making the original Neo's) and it seems like it took them a few days to get back to me...