For example, they compared two Sleep number beds: the c2, which normally costs $1,000 and was on sale for $700, and the Innovation Series i8 (Pillowtop), which cost $3,000. In objective tests that they run using specialized equipment, they found that the less expensive bed, the c2, was actually more stable than the pricier one, which means that a person sleeping on one side won’t disturb their partner on the other half if they move around a lot while they sleep.
Of course, there are real differences that account for that price discrepancy. Namely, the more expensive mattress has a thicker foam layer on top. You might find that more comfortable for sleeping, or you might prefer a more stable mattress: that’s why it’s important to try them out in person instead of depending on price as a proxy for quality. You already knew that, though, didn’t you?
Sleep Number beds differ in price not performance [Consumer Reports]