Even though I usually don't particularly care for memory foam as a mattress or topper, I was pleasantly surprised by this one! The only reason this isn't five stars is because a rather unsavory paint smell accompanies the first few nights (I'm assuming this is due to product offgassing.) truly it would be more like 4.5 stars but the review process doesn't accommodate that. 
This foam doesn't seem to have the saggy, falling-into-a-hole feel that many memory foams do. I have slept more restfully since acquiring this apparatus and can highly recommend it's desirable properties! I love the fact that several holes in the product ventilate so as to not sleep too hot. The offgassing was a bit of a turn off, but a few days in the sun would completely cure it.