This 4" gel top memory foam is so comfortable.  I read reviews before purchasing, and I could not be happier.  I've been looking to replace my mattress, but get so confused by all the different offering when I go to purchase the mattress.  So that is why I went with the topper and could not be happier.

Pros: easy assembly, open put on bed......sleep soundly.
Cons: I have not found any...