This review is a comparison of the Signature Sleep 8" and the Spa Sensations 8" memory foam mattresses:
We bought the Signature Sleep Memoir 8" in a queen for my 14-yr-old son three months ago - it is VERY FIRM (he would have preferred even firmer, but it is quite firm). I am 110 lbs. and can sit on the edge without it compressing much at all. When i lie on it, it takes the pressure off my hips and shoulders but otherwise has very little give. It feels hard in a way, yet i took an hour's nap on it and awoke in the same position (back) feeling comfortable and rested.
A month later, i had planned to buy the same mattress in a twin for our youngest son who's 10. Despite having a bed, he has been sleeping on the floor for years - just where he ends up. So he is used to a firm surface! However, Walmart was out of stock on the Sig Sleep 8", so we decided to try the Spa Sensations, which also has great ratings.
Like the Signature Sleep 8", the Spa Sensations 8" is described as 'firm.' It is, but i would consider it a medium-firm, and it is notably softer than the Signature Sleep. When I sit on the edge of this mattress, it squishes down 4-5 inches. It is much softer to move around on as well. One difference though - we have it on a bunkie board instead of a solid platform, so that could be contributing to the softer feel, but it would still be softer than the Signature.
The Spa Sensations has a 5-yr warranty; Signature has a 1-yr. warranty. But, i don't really think that means much in the world of mattress warranties. I think the Signature will probably last longer and be the better value. However, my 10-yr-old loves the Spa Sensations and truthfully he will probably outgrow it before we need to replace it, so we are keeping it.
I will add that the Signature Sleep Memoir 8" also comfortably supports my older teenage boys (both 6 ft. tall and around 160 lbs.), and we are getting one in a twin x-long for my college-age son for when he is home. (The Spa Sensations 8" is not sufficient for their weight - compresses too much and i think if they slept on it all night it would leave body impressions.) Also, I spoke with a representative from Signature Sleep because we were considering the 10" for my 18-yr-old son; she confirmed that the 8" is firmer than the 10" - so if you want a FIRM mattress and want something thicker, go up to the 12".
My advice if you are undecided: go firmer. You can always soften a mattress that is too firm with a mattress topper, but it is impossible to make a too cushy mattress be more supportive. The nature of memory foam is to soften over time, so it will only get softer.
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