I've only slept on my bed for four nights, but my back pain has lessened significantly. So far, I'm very pleased with my mattress.
Things to note:
This mattress DOES off gas. It's not terrible, but I have a sensitive nose. We've been sleeping on it for four nights, and still need to keep the windows open.
The delivery estimator on the main webpage was not accurate. However, when I called to find out when my mattress would ship, the mattress went out that day.