It's lovely, I didn't realise how much the old one had deteriorated! A bit firmer than in the shop but the nice chap did make that clear before I bought it. It's settled down a bit now and my back has been so much better after just 2 weeks on it. It's cooler than the memory foam one which is what I wanted anyway. It doesn't move much with both sides being used at the same time. It's pretty deep so take note of that as it's quite high off the floor on a divan base, but I was used to a lower wooden frame anyway. You might need some deeper fitted sheets to cover it completely although it's a lovely looking mattress in it's own right. I'd say that the medium one would be a good fit for most folk, but this form one is perfect for me with just mild back pain during the day, but gone in the morning. Don't hesitate, it's worth every penny! After sales messages very informative too, delivery spot on and really nice couple of blokes.