After much research, I chose this mattress to replace the original on a futon.  This is a thick, comfy, good quality mattress. It's being used in our guest room; 6'3" grandson stated it was very comfortable and had a good night's sleep. The mattress is very compacted when it ships, but after lying flat for a week any lumps from being folded went away. I'm very happy with this product.

Pros: Good quality, firm support.
Cons: None