I love that I can open and close the louvers. Pergola is sturdy and provides shade. Directions/video helpful but they did not indicate that the fasteners on the ends of B1 need to be loosened so that you can slide B1 into A. Design flaw: Since all part A are identical, drainage holes at the bottom of columns are in the same location. There should be holes on every side so water can drain better.  Pergola should be pitched slightly so water drains. It took five people several hours to put it together working like an assembly line.