These are great! I love the look of them. We purchased 2 for our special needs room at church. It provides the vestibular sensory input that some of our kids need when they first arrive at church in the morning. They were easy to assemble - you simply screw on the legs, place a deflated ball (included) inside the cover, and pump with the ball pump that is provided. IT took about 20 minutes to assemble and have a really cool look to them.