Got the firm queen version, and it feels exactly like the Ashley anniversary firm mattress that I tried in their retail store. I'd guess they were the same bed -- just branded differently. And the sierra sleep limited edition is more than half the price! Very firm and substantial feeling up top. No sink or lag like with memory foam/hybrid beds. Can't feel the springs up top but definitely can feel them from the side of bed -- so I don't think there is a perimeter of dense edge support foam as pictured. Even still, the edge doesn't sag like hybrid mattresses I'm super happy with this purchase, especially since I was very disappointed in the olee sleep Omega hybrid, which was described in reviews as firm, but it was actually quite soft and sagged, particularly compared to this bed. If you truly prefer a firm mattress, this one is actually firm. If you're a side sleeper then you may not like the feel, or May want a thin foam topper on top.