Shape is great. But the air pillow slowly loses air and eventually makes it sag in the middle, in the MOST uncomfortable way. Until they fix that, I wouldn't buy it again. I have one that we will try to prop up in the middle with foam, maybe.
"My predominant feeling is one of gratitude. I have loved and been loved;I have been given much and I have given something in return...Above all, I have been a sentient being, a thinking animal, on this beautiful planet, and that in itself has been an enormous privilege and an adventure." O. Sacks