Brilliant set. Daughter (4) loves it. It's a good size without being too massive, but still expect this will provide many years of play. Not added den yet as I'm going to put ties on it so it's removable. Assembly time was about what was suggested in the guide, but hubby is particularly handy with power tools and we've always got DIY on the go, so would likely take longer if that's not your thing. But instructions are pretty good. Activity Toys were brilliant! I had a few questions in advance of purchasing this and they were super helpful. Product arrived quickly and in great condition. Very happy customer!