I wanted to like this mattress....Delivery was great, no chemical smells at all, mattress got it size in no time, almost immediately,  BUT....
My 130lb body sinking in it. As a result of it i have back pain every morning.  Im a back sleeper, so i was trying to sleep on my sides hoping to avoid back pain , didn't work. Besides the pain the heat wasn't also helping my sleeping. I spent 4 nights in "hot hole" trying to adjust,  can't take more..My verdict about this mattress is:
• too soft for medium firm
• too hot to sleep on it
• too soft on edges to seat on it
I will return it