Sleep Number’s high-tech smart beds promise maximum individualization, offering a tempting option for the sensitive sleeper or the couple with divergent mattress preferences.The company’s mattresses employ air chambers in the foundation, which sit below comfort foams and inflate or deflate on either side depending on the sleeper’s desired firmness levels. The mattresses also have smart sensors, which respond to your movements throughout the night and automatically adjust for comfort and pressure relief in real time.Though we haven’t tested Sleep Number’s latest lineup of mattresses in person, we have tried previous versions of several Sleep Number mattresses, and in general, we think you can find a comfortable and quality mattress with denser foams for a lower price elsewhere.If you and your bed partner can’t compromise on your firmness preferences, and you have a flexible budget, some of the higher-end Sleep Number mattresses, such as those in the Performance or Innovation series, might be worth considering. However, because the company didn’t share with us the foam densities for any of its mattresses, we don’t know how well they may hold up compared with comparably priced mattresses, especially for people over 200 pounds. We do not recommend the less-expensive Classic line, which is just too thin to be comfortable for many people.The company currently offers a dozen mattresses in its lineup, each with a different level of cushioning and emphasis on cooling. Sleep Number beds are available to try in person at one of the company’s official stores across the country; they are not sold through unauthorized third-party retailers. Sleep Number offers an industry-standard 100-night trial and a 15-year limited warranty on all of its smart beds.Here’s everything you need to know if you’re considering a Sleep Number mattress.