I think your product would be great for most people, but because I have back issues (arthritic lumbar facet joints) I'd prefer a firmer mattress. I'd actually rate it an 8, but price, packaging and shipping get you an extra point.
We've ordered two kings now, and absolutely love them! They arrive so quickly and conveniently, the firmness is perfect, and at such a great price. Plus, I expected them to have a smell that would need to air out, but it's ready to go right out of the box. I've already referred the product to two friends and they love theirs too!