We bought a Cal King Sleep Number 4 years when we upgrade houses. It was the promise to my wife to stop her from pushing me to get something before we upgraded houses. I love it and consider it well worth the price. The biggest perk is the difference in firmness preferences between me and my wife. I sleep with my side at 90(more firm) and she sleeps with her side at 35(soft af). If we weren't able to adjust each side separately one of us would be very miserable every morning. Something to consider.
