Firstly, I bought this mattress in a king size. Well you get what you pay for. I read reviews before about feeling the springs through the bed so I was prepared with a mattress topper for that, which I'm grateful for! 
You wouldn't want to be an overweight adult sleeping on this. It is thin, I couldn't imagine being a pair of adults sleeping on this. 
It's fine for the purpose I bought it for, which was my child's bedroom. So it'll do for her and she has had no complaints about it, only that her bed is now lower.