I got the tetherball system for my grandkids. It was perfect to set up in the driveway so when they visit we can play outside. It took about 40 minutes for my son-in-law and I to put it together. We filled ours with water and it was fast and easy.  My favorite feature is the ball!  I always remember them being hard this one is very soft. The system is very stable and does not wobble or move during play. My grandkids really love it!  They like to play together and by themselves.  Their ages are from 3 to 12 years old.