I bought this mattress after laying on it in the store. It felt soft and cushy, but with firmness underneath. After sleeping on it for less than 2 weeks, I noticed it was "sinking" in the spot I normally lay in. And that side of the bed was extremely soft, with no support, while the other side of the bed was firm. After calling the store, they said that Serta had informed them that if you don't start sleeping in different areas of the bed, it can actually start to "hot dog" around you. What kind of mattress is that??? So I started sleeping in different areas of the bed, and it would be much firmer when going to sleep......but when I woke up....it was soft again, and sunken. I tried moving the mattress end for end (since you aren't supposed to flip it) and that worked for a few nights, and now I'm having the same problem with that side of the bed. So, the firmness does come back somewhat after not sleeping in that area for a few nights. The biggest problem is though that by the time you wake up in the morning, it is so soft underneath you that there is no support and your back hurts.
Serta Boulevard Mattress is not recommended by mypointis