Package arrived quickly and undamaged. I used regular 4x4 posts for all the places. They fit in easily and I did not have the experience that other had where they didn't quite fit. Assembly was fairly easy, I used shims to make sure the posts were level and placed the posts inside the floor pieces, but I did not fasten them initially so that they had some play when I attached the roof. Getting the roof on there is a chore and you will need some other help, at that point it was only my wife and me, and my smaller son who could. It took quite a bit of strength and strategy for us. We had to prop up one side with a ladder while we fit the other corners in place. If possible I would recommend you install the floor and posts first to make sure the are straight, but then use take them out and use them to guide and move the roof into place. With two people it was difficult, but I think if you lift from opposite corners using the posts you could probably make it work easier. The instructions recommend using at least 3 people and that is no joke, with 3 it would be much easier. Lifting the roof to that height with the posts in place was very difficult. But once we were able to get one side in, then we could use the vertical posts to lift the rest into the floor posts. Again, if you have the adult people power (3 or more would make this much easier) then you will have little problems. But that roof is really heavy on its own. Once every was in place I used more shims inside the corner and floor pieces to make them fit a big more snugly. I only give 4 stars because they do not supply enough screws for all the holes (there are (8x6=48) for each corner and (8x2=16 ) for each floor and at the price they sell them for I think they ought to supply you with enough screws. I bought enough to put a screw in every hole and it is pretty solid and everything fits pretty snug. I will use nail polish or something to paint the screws so they don't stand out. Overall we like it!