The cats think this is the cat's meow. I'm frightened that one of them will topple it when they jump from the second floor balcony to the top tier, but they haven't yet. This was stable, and pretty easy to assemble, though it's also easy to mix up one or three pieces if you're not completely concentrating on what you're doing. The ropes have given way on some of the posts earlier this year, so they will need re-roping, but that is the only complaint after a year and change.

Pros: Tall but not huge, stable, assembly easier than other reviewers indicated.
Cons: Ropes are not great quality, so they lasted a year or less, but are easily re-roped for those who are handy.