Mine weighs 12.3 oz with bag, repair kit, and pump bulb, and is extremely comfortable with the side edge tubes being thicker than the ones in the middle. This feature prevents my arms from steeply falling on the ground in case I am turned on my back.
This "flailing" arms issue causes me lots of discomfort on my narrow winter NeoAir, forcing me to sleep mostly on my side. I am a sidesleeper, but every now and then seek a different sleeping position and end up on my back for an hour or two.
X Wave's R value may be questionable, but definitely exceeds 2 in a combo with a widish quilt, making it good enough for shoulder seasons for me.
Its bottom is made out of 75D, obsoleting a groundsheet when used without a bivy in a floorless shelter.
It gets augmented by a 48" long 1/8 Lawson Eqpt. CCF pad, folded in 2 under my legs or used as a seatpad. The bulb pump easily adds firmness when desired.