I am in the process of putting the pergola together now. I agree with others reviews in regards to the instructions.  It would be much much easier to know before you have the base structure put together that you put the supports into the slots far enough that the slats will align with the drill holes.  There is no insurrection on how far to put the supports into the slots and now I am having to use a ladder and mallet to push them through further.  It’s a solo project so would have been nice to know. 
I do like the look of it and quality seems good for the price.