This is EXACTLY what I was looking for. I sleep primarily on my back and sometimes side, my husband sleeps primarily on his side and sometimes back. The "softer" side of the Plank Firm Lux is a perfect balance for both of us. We really wanted a firm mattress that was still easy on pressure points to help alleviate back pain (I have sciatica). If you want a truly firm, quality mattress at a reasonable price point, this is it.