Hi RandomSanity,
You can see some comments about the Leesa mattress and many of the other "simplified choice online mattresses in post #2 here in the simplified mattress topic.
I would be cautious here because the 2" of 3 lb memory foam in the Leesa is a lower quality/density material than the minimums I would generally suggest in the guidelines here and I would consider it to be a potential weak link in the mattress (although the 2" of Avena polyfoam above the memory foam would improve the durability of the memory foam somewhat compared to having the same lower density memory foam in the top layer of the mattress).
Phoenix