Are memory foam mattress any good?

My body is killing me from being over worked. And since I need a new bed, I was wondering if a memory foam mattress is worth getting. I see it on amazon for around 200 or 400 dollars. Just want to make sure that they're good mattresses before I spend the money.
They're Really good!
I never slept on one.
They're not that great.
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Are memory foam mattress any good?
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