Overall quality is good with attention to detail such as velcro pads to hold the cushions in place. I had sore fingers after doing up the 86 bolts and the tools provided make each one a slow and fiddly process. A straight (rather than angled) allen wrench would cut assembly time in half. 
Also the instruction omit any mention of the spring washers provided along with the flat washers to go on the nuts and bolts. Although they do appear in the video, this was no help to me as I did not realize I should have been using both spring and flat washers until I had already assembled the two corner sofa pieces.
Overall the assembly took me 5 hours so customers should be prepared for this.
I would also suggest using a better shipping company. Not only do they not provide a delivery time slot but then I only received 2 of the 3 boxes and had to wait 3 days for the 3rd.