So far so good! Three 9 month old 10 pound kittens and their crazy momma love it. I think the weakest part will be the top ( we call it the taco) because it does flex quite a bit when they are doing zoomies. But the rest is heavy duty. The connections for the pieces were screwed onto the wood as well as mounted into the 2x4’s. Take your time connecting the pieces so you don’t over tighten. 5 total pieces, what a breeze to put together. Fingers crossed it holds up long term to the spazzes !