I've just assembled this set, but as it is December in the northeast it will be a while before it gets any use on our patio. Assembly should have been a breeze - the love seat only has 4 parts to connect, and the bolt holes are all nicely aligned. Oddly, more than half of the bolts that come with the set are too short to comfortably do the job. After a few frustrating minutes I took one of the bolts to my local hardware store, and was able to find longer bolts to use instead (if you do this, make sure to match the metric width and thread!).  With the longer bolts completing assembly was easy. I'd also suggest having a couple of c-clamps on hand to help pull the sections together during assembly - this is a lot easier than trying to squeeze them together with your hand as you are also trying to secure and tighten the bolt. 
This set looks great, and seems to be quite well made and sturdy. The cushions seem substantial as well. We can't wait for winter to come and go!