This condo is perfect for our 15 year old kitty -). It took about 1.5 hours and did it by myself. I’m pretty handy and felt everything was straight forward. I caught a snag when I was done cause the bottom piece was backwards so when i went to add the doors, i realized the holes for the pins that hold the doors together, were on the backside. It was easy enough to remove the bottom without affecting the rest and just moved the back to front and everything was fine. I had to make a starter hole with a small nail for where the small screws go cause the holes weren’t pre drilled all the way. My puppies chewed up the cushions ( I left the box open overnite) so i just bought a replacement. I felt it was easy enough to put together. The instructions could have been a little better in certain areas. 
It’s a sturdy piece and it’s perfect for what I needed.