We have a SleepNumber bed at home, and my biggest complaint is if you don't have it set to a high number then when getting into bed your knee can go right through the mattress to the hard plastic platform! Once you are laying down it's fine, everything evens out, but that can be quite a shock when first crawling in. We have added a foam topper to ours, which helps substantially. I do like the fact that I can alternate between a moderately firm mattress most of the time, and a rock hard setting when my back is acting up.