IKEA is crap. Pretty comfortable initially but says within a few years, we bought the more expensive range too. We then bought an Emma, far too hard, a Simba, which felt comfy initially but then did our backs in by morning.
We have now bought a wool mattresses from wool room and it's the most comfortable mattress we've ever slept on. Initially we thought it was a bit soft, but it's actually so comfortable. A few people have slept in it when looking after the farm and almost everyone has said the same thing, initially felt too soft but was incredibly comfortable.
They're not cheap, but worth every penny given how long we spend in it!