I bought this mattress based on the reviews I read here, and I'm so sorry I did. This is quite possibly the worst mattress I've ever purchased. It may "feel" firm, but it's very wobbly side to side so it feels like you're sleeping on jello. It also sags in the middle, and if two people sleep on it they will roll towards each other in the middle (i'm talking normal 130-150lb people too). I use this mattress in my guest room, and even the guests hate it lol. I only spent slightly more for my W Bed mattress, and it's light years better.