While I haven't had a chance to use this mattress, as our baby isn't here yet, I can say that it's firm, as it should be, and seems to repel liquids (as evidenced by the spilling of a bottle of water during nursery painting). It's the appropriate thickness for the crib that I purchased, as well. I bought it based on the previous reviews. If I find any reason to change my review after baby arrives, I will certainly make an addendum.