I obsessed about buying this couch for months! I really, really wanted a white slip covered couch that was deep but I didn't want to spend $2k and I didn't want a cotton one since it absorbs so much oil and dirt. 
I have two white golden retrievers and although they aren't allowed on our furniture their hair floats everywhere. I ordered tons of samples and eventually found the "Bevin natural" which is perfect! It's a blend of polyester/linen. It's still soft and has justtge perfect texture. 
I read every single review on this couch. Will echo what everyone else has said. It's super heavy- super long. The slip cover is a little loose on the frame but this doesn't really bug me- it was the look I was going for. 
The seat cushions are pretty firm and the back cushions are down wrapped foam. It took 6 weeks start/finish. Birch lane service was top notch. Don't hesitate to buy this! It's so much better than I expected.