Have had both an original neoair and a neoair all seasons I'd say the original is noisier but the all season more comfortable. My mate has the synmat ul and it seems ok, but must admit I've heard it making a fair bit of noise as he's moved in his tent. I think its one of those things where you hear the other person's noise more than your own.
There are at least 5 flavours of neoair now,and not all suffer the alleged failures.
As for noisy mats keeping you awake, ear plugs sort that.