I've given this review 4 stars for product and company service even though I've upgraded to the Mint. This one didn't help me with the chronic back pain but my wife found it very comfortable and would probably have given 5 stars. I'm still in early days with the Mint so shall review that in a few weeks.
We Purchase this mattress for my daughter since I was so happy with my queen size one. The twin does not feel as soft as the queen and since she is small, she doesn’t move the mattress much so feel hard for her. But she can grow into it and as she gets heavier she may find it softer.
This mattress is perfect for someone who sleeps on their stomach and doesn't want to sink into the bed. I also love laying on my mattress when my muscles are sore because of it's firmness.
Overall I find the queen mattress quite comfortable. I would like a bit more support (I sometimes find that, for sleeping on my back, it's not always as comfortable on my lower back as some higher-end mattresses). I do think it sleeps just a bit hot, but with AC in my apartment it is OK. Overall I would say great quality for the pricetag.