I'm a heavy guy with most of my weight around stomach. Finding a mattress that doesn't sink me yet soft enough was impossible. I was craving for a comfortable sleep after hitting gym every evening. I have returned Wakefit dual comfort mattress for the same reason and was almost sure this one is going to be returned as well. All my life I slept on hard surface and felt maybe soft mattress aren't for me. Because I read in few reviews that it is medium firm and gives reasonable back support I thought of giving it a try.
Day 1: Damnit. It is too hard and very little soft. It was hot as well. Day 2: I decided to return it and ordered another mattress. It still felt hot. Day 3: It's been 48 hrs since it was unpacked and the mattress expanded fully. It became soft enough. Had a good sleep. However, it was little hot. Day 4: oh man, I love it. There on I have been sleeping nicely, no more waking up in the midnight, thus, I am waking up early comparatively.
NOTE: It isn't perfect mattress as I still feel little back pain sometimes. If you want one with more back support, maybe you shall consider buying at store. This suggestion comes after purchasing few online and finding them much softer.
Only issue with every foam mattress is that it retains little heat. If mattress is used is AC room, that won't be a big deal.