I've only had it for less then 2 weeks. I would need more time. It's fine when I'm sleeping on it but when I sit on the edge it's too soft and I feel like I'm going to slip off the bed.
Great mattress, we have a temporpedic and bought two Tuft & Needle the last month for he kids. We slept on the tuft and needle to compare it against our Temporpedic; pros and cons with each but a T&N was a great value!