I sat on new couch for 2 hours and can see the couch cushion slump already. I laid my head back and can tell it may not hold up for years like we would like for the price. 
I think the top layer of cushion may need a nore dense foam? The back cushions are not too firm and will not hold up for continuous use. 
*This is just speculation, based on my short time of having this new item. 

This couch is beautiful and very large. Extremely comfortable. Exactly what I was looking for.