I've been hanging wallpaper---traditional and peel&stick---for years.  This one was by far the most frustrating.  I followed the instructions to overlap the seams but they still (and continue to) spread apart. Since I spent so much on the paper, I'm just spending a lot of time with a black Sharpie filling in the lines.  
In all fairness, the customer service rep was wonderful in trying to remedy the first issue I found: Although the rolls were all from the same lot, they did not match up and weren't even cut at the same point in the pattern. Because of that, there was a lot more waste than I anticipated and I had to get another roll. 
The paper is gorgeous, but I might order any William Morris patterns from another manufacturer next time.  This "one-off" didn't respect the quality I expected.