Really Nice
My sons LOVE their mattresses. They're really happy with how comfortable they are. I've got to admit, I'm happy with how comfortable they are. I might have to replace my husband and my mattress. It's supportive and the sides don't collapse when I sit on the edge. There doesn't appear to be much movenment transfer. I can't fully attest to that as it's not my bed, and my kids don't share a bed.
Also, I was led to this bed by Nap Lab. It's on a list for best mattresses for kids. I'm glad I listened.