Great quality. Leave parts in the boxes, just find the reference list in each box. It is super easy if you take your time. We built it in about 3 days, husband and wife. We have worked on lots of other stuff together over the years, so we got into our groove of me setting up the steps and bringing bins of pre-sorted parts need to him to screwbuild. He used the app instructions and I took the paper copy for 95 of it. We did have to use both on some steps to get the whole detail. Turned out great and is holding up well to all ages. Set is 5 months old and still looks brand new.