I bought this particular condo because I have two cats- a very active sphyx and a cat who has a deformed paw and trouble jumping.  I thought that the multiple levels would allow the special needs kitty to climb up to the top.  Problem was at first that the carpet was so soft and slick that he would try to climb on the carpet portions and just slide off!  He has figured out how to climb around on it though without sliding off the carpeting- he climbs up the tree trunk and is able to reach the very top with no issues now.  The spynx had no problem and loved it from day one.