Mattress is comfortable. I slept on one of the mattresses for about a week before the kids got in it. The 6 year old seems to sleep well and the 3 year old, well, we can only guess.
It does take a few hours to fill out to the full 8”- we had no trouble with that. Not giving it 5 stars because we let it stay out about a week to air out that normal mattress smell. It lingered longer than any boxed mattress I’ve purchased.