I bought a Leesa memory foam mattress about three years ago as a Christmas present. It was fascinating how a box that fit under our tree could expand into a King size mattress. The low price was also a big bonus.
Unfortunately, after giving it a few weeks I was not impressed.
First, the smell was unbearable. Even after three weeks it was still enough to burn my eyes and nose. That made sleeping difficult and it couldn't have been healthy.
Second, sleeping on memory foam was like sleeping in quicksand. It was comfortable until we tried to move. The bed sucked in around us, making it difficult to turn over or push off to get out of bed.
It was also warm to sleep on, even in the middle of winter.
And let's just say it added complications to whoopie.
I really tried to like it, but after three weeks I couldn't take it anymore. I called the company and asked for a refund. I expected this brand new mattress to be donated to charity or something, but they sent out the 800-Got-Junk folks to haul it away as garbage. It was clear from the way they threw it around in the dirt and gravel they had no intention of donating it. I appreciated the refund, but that seemed like a huge environmental waste.
Also, the memory foam mattress had no structure inside. So trying to move it was like wrestling a 60 pound silly putty snake.
I know memory foam mattresses are the new "thing" these days, but I would never buy one again. Perhaps it was just a bad model, but my first impression was not a good one.
For what it's worth, my mom bought a top of the line Tempurpedic memory foam mattress (thousands of dollars) and has all the same complaints I had with ours.