Installed 2 years ago with help by my adult son. Went together very well. Took us 2 full weekends - start to finish. I bought the base moulding pieces for a nicer look. 
Used treated wood for the framework & the vinyl slipped on easily . Needed a few extra long screws (higher quality hardware would be a +) as heads easily stripped out...customer service quickly sent out extras . not cost no fuss. Very happy with the finished Pergola. Highly recommend.  My total cost (lumber, tool rental(hole digger) post anchors, etc came out to about $3500. Not bad.