I rated this product on size, not for any other reason. I ordered the comfort Dreams 9 inch memory foam mattress. The height is 9 (as stated) but the length and width is 73 X 36 (Not 75 X 38 as stated). I wouldn't call a 2 inch shortage on the length and width a "Slight Variation" in size. In overall square footage that is a foot and a half less of sleeping space. I'm not too happy even thought I purchased this for my 3 year old. I bought a mattress for my 10 yr old when he was three, if it was this one, he would be too big for it. The extra inches make a big difference. I expect a mattress to last at least 10 years, this is an investment not a will do for now purchase. It lessens the value of the product when I have to replace it sooner than expected.