The new kittens and my 8yr old overweight tabby all spend time on it.  The kittens all the time.  Pekoe, at 20 lbs loves the top perch--queen of all she surveys .  It  was very easy to put together--per my son.  It is very sturdy.  For ease of cleaning I put small pads in the condos to keep the inside clean and that can be removed to be washed and/or vacuumed.  Right now the kittens are staring out the front window from one of the perches.