It is not as sturdy as I had hoped. Time will tell how if it will hold up in wind and rain. Definitely not something that can be left outside over the winter.
It went together very easily. It took less than 2 hours. Our 2 cats seem quite comfortable in it, although I would not recommend leaving them unsupervised. Our one cat got a claw caught in the mesh and could not get himself loose. He would have hurt himself if he would have struggled on his own to get loose.