Some first-trip feedback.

The XLite is warmer than the original, as promised by the R-rating. Was able to do a side-by-side comparison with my friend's original. FWIW I would have been warm using either, as it was only in the 40s overnight.

Like the original NeoAir, the XLite is most comfortable with less air than a traditional air mattress. This is expecially true for a side-sleeper.

The new mattress top has an anti-slip surface that's annoying to sleep on directly when using a quilt. I preferred to flip it over, even if that's not what the designers intended. It's possible the reflective insulation is less effective this way, I don't know either way. The good news is the new valve position at the side makes flipping the mattress possible.

The 66-inch length is fine for a six-footer who uses a pillow.

Finally noticed what makes mine "irregular"--a big slice along much of the bottom reflective layer (visible directly underneath the translucent bottom shell). I can't foresee this becoming a problem, but will watch for any future delamination of the reflective fabric.

That's my story so far.