My kitten Milo is 14 weeks and such high maintenance....he always wants to be by you or causing trouble near you ....he is into EVERYTHING!  Since I put this tree together (its only been 2 days) he LOVES it and is always on it....I added longer string to the balls when I hung them, but he has a blast! He even fell asleep on one of the top perches.  This is very good quality and super sturdy! I highly recommend this for anyone with those high maintenance younger cats still full of energy.  This will wear them out!