I mostly sleep on my side and after some seasons on the BA/POE insulated mattresses (full and 3/4 length) I tried the NeoAir last season and have switched permanently. I suspect the biggest comfort difference is the NeoAir cross-wise air chambers, but whatever the reason it's just more comfortable.

I also had to learn to put less air into it.

The other payoff is less pack space. The darn thing is tiny.

Cheers,
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--Rick