Pros
My cats have loved this for a couple years now, some minor wear and tear, but otherwise holding together very well despite a lot of scratching and playing. Even though the tower is very narrow and looks like it would topple over with aggressive cat play, it has always remained upright and has never even swayed. I’m very pleased with the amount space this kitty condo saves when compared to my previous purchases that seemed to occupy an entire wall of my living room. This is just a nice corner piece that blends in with other furniture and decor. 
Cons
It did take some time for them to figure out how to get to the top level, maybe a month or so. It doesn’t have a platform from which to jump to the top tier so it was a little challenging for them to figure it out. It was also something that my much older cat couldn’t manage due to arthritis and decreased agility. My younger cats liked it though, once they figured it out.