I have had the bed for 2 months and it has started to sag. I have bought this bed twice now. The sagging was so bad the first time and I had photo evidence and they stated it was because I didn't have the proper frame and it wasn't covered by warranty. I bought the same mattress again with helix's box spring and the bed after two months is starting to sag in the position I sleep in every night. I rotated it a three times. This is the bed they recommended after taking their test. Not sure I can in good faith say this is the bed to buy.