The comfort level is NO way a firm one. It's  spring based and literally you can feel springs when you sit on it. when you are sleeping on the bed spring feel goes off but you can feel that its cushy than being firm. 
I am just 130 lbs/60 kg , and on this mattress i dont feel any firmness, got it for $339 + taxes, for the quality i feel its way expensive compared to my other zynus extra firm mattress which i got for just $350. 
if you are paying anything more than $250 for this it is waste of your money