I bought this mattress for my athletic teenage son. It was time to swap his old spring mattress (bought 8 years ago) for something firmer, more for adults. It did not take long for the mattress to expand out of the box but we let it sit for 48 hours anyway.
My son had problems staying asleep before and now he is sleeping through the night and was even late for school the next day! He says it’s firm but comfortable. It also has a nice thick cover to help keep it clean.