I purchased the Kingsdown mattress at Bauer's furniture, that was my first mistake. This was the second time I've had defective or poor quality merchandise from this store. Due to arthritis, I was very selective about the mattress not pressing on my sore hips. The Kingsdown appeared to provide comfort. Now, after just 3 1/2 years the sagging, which measured 3/4 inches, is causing great discomfort. I've added 2" memory foam and a down featherbed but it does not compensate for the collapse of the innersprings. I would recommend you select another mattress, DO NOT buy Kingsdown. Comfort Initially the bed provides comfort, however after just 31/2 years the sagging has destroyed the comfort. Not only my comfort but that of my partner who found the sagging unbearable. It's not comfortable when you have to seek out the edges of the bed to sleep. Support Once the springs start to collapse the support is gone. Firmness This mattress was purchased to not be extremely firm. So if you want firm this is not the best choice. Durability I exercised my right under the warranty to have it inspected. In the opinion the the mattress contractor sent by Kingsdown, the mattress was performing as intended. The 3/4 inch sag was perfectly fine under the warranty terms. The mattress has a 10 year warranty. If the sag is at 50% after 30% of the warranty period, that is defective to me. Alas, it was not to Kingsdown.