Maybe user error but I can’t figure out if way that we would of had a different outcome. The design is beautiful and easy to install! Someone else mentioned about the black rubbing off and leaving little white dots, but personally I like the way that looks. 
the issue for me was that we were using it on a half wall, we figure we would need half the amount. But because of the way the pattern repeats, in order to get it to line up we ended up with a ton of waste. Needed to order 2.5x more than we originally figured and just have 13 of the pattern left over that won’t line up with other pieces. Hugely wasteful and not to mention ended up double the price!!