It is plenty comfy. you do not feel the boards underneath. i also got a 4" full XL to replace the overhead bunk..i enjoy the extra comfort. just wish the wife and dog would left me sleep in it longer. but you do have to make up the difference. the main body of old mattress is like 4" and the end piece is 6". there is a gap between slide out and the base of bed. people will say get a mattress topper. life is to short not to be comfortable. make the bed while it is folded and then when you unfold it is all done. mattress pad, fitted sheet the top sheet. you can get to corners better. then unfold.
patrick
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