I bought this as a replacement for the silentnight orthopaedic mattress which was too firm for me. I’m really glad I chose this one as it’s a lot comfier and I’ve slept much better since swapping. The mattress is better for me as it’s lovely and deep, it has handles on the sides and it’s double sided so much easier to flip/rotate than the previous one. 
It’s also much cheaper on wayfair than other retailers selling the same, over £100 difference! 
I have lumbar spine problems and I was worried about swapping to something softer but I find this one just as supportive and a million times more comfortable than any I’ve had in a very long time. I never want to get out of bed!