My 4 month old kitten was all over this thing before I had it partially set up. He's an acrobat and a climber, but I could tell that 3rd level would be difficult to reach, as other reviewers have mentioned. I noticed matching drill holes on the two upper main levels, so I swapped mine around and now have the rope hanging off of the second level, with the peep hole on the 3rd. My kitten is able to climb up thru the hole to reach the 3rd level or climb up the sides of the sisal rope columns. Now the bottom tier has a purpose; my kitten has been rolling around on the ground playing the rope. I think the tree is much more functional with the tiers swapped around. I would definitely recommend this cat tree for anyone with an agile cat!  

Pros: good value, attractive, sturdy
Cons: tiers need to be swapped for functionality