Fabulous! Needed a new mattress quickly as ours sons was no good. This arrived next day and I have to say I'm so impressed!!! I asked him was he thought, he's 7 and said 'it's so comfy, I had the best sleep ever!' I can confirm he did have an epic sleep, and made it past 6am! 
I alsonhad to have a lie down on it and can confirm that it's as comfortable as our mattress which annoyingly we paid alot more for! 
Plus you get a 10 year warranty. We will be purchasing another one for our daughter.
Very happy customers (I'm also hoping the decent sleeping continues)