We bought the Trenton pergola for our back patio and are very pleased with the purchase.  Our two sons-in-law assembled in roughly six hours.  On the first day everything went well, until we discovered that one part was mislabeled, meaning we were short one necessary piece for the assembly; a call to customer service resolved the matter quickly, with the needed part being sent the next day. The next weekend the assembly resumed.  The finished pergola is very sturdy and looks great.  We are very pleased with Backyard Discovery and their products.