This is preying on "wellness" concerns. Casper convinces you that a problem exists where it previously (probably) did not, that your sleep is suboptimal, and that only they can fix it for you. Prehistory, humans slept on beds of grasses or reeds on the ground. I still think 80% of your sleep quality is determined by what you do in the day: caffeine intake, amount of physical activity, overall stress level.

I have a Casper. I found it way too firm as a side sleeper, but it was too late to return it, so I bought a $100 memory foam topper from Costco to make it more squishy. I could have saved a lot of money by buying Zinus mattress from Amazon and adding the topper, but oh well.