Happily Surprised! Starting the assembly, each part seemed flimsy. As it went together the entire greenhouse began “firming up” with each additional piece. Finally completed we are impressed with the engineering detail and structural integrity. Assembly was not easy. There seems to be 1,000 plus parts but if two people follow the instructions closely it can be done in about 5 hours. There are assembly videos on YouTube. We screwed the unit to the base rather than using the enclosed clips and I’m still adjusting the sliding door (user error during assembly). Holding up to WNY weather and high wind loads (40-50mph gusts). Wife loves it.