I bought this mattress first because says firm, second was 8 inch. Third  good price.  Now you get what you pay for it. As price is right,  thickness is less than 8 inch. But can live with that. My bigger problem was firmness. Way to soft for my back. I'm 6.1 185lb.  And the mattress squeeze inside when sitting like crazy,  no edge supports at all. Top fils like pillowtop,  some may find comfort but it says FIRM innerspring and is NOT! Now need order 2or 3 inch. firm or extra firm top to fix this problem hope will work together if not need look for new mattress. 
Overall not terrible for the price,  but Ashley need fix it from firm to medium so more people don't fall for it, costumers  who need something firm for back support!