I bought this mattress because it was on sale and had decent ratings.  I would have to agree with most posts.  It does its job as a mattress but doesn't have some of the support others have. I had to buy a second crib & mattress since my kiddos are 13 mos apart. So in comparison to the first one I have, which is foam supported, this one is very springy and my little one slightly sinks into it. Not ideal, but no real danger and I'm not losing sleep over it.