My son saw one of these at a friends while on a trip and played with it the whole weekend. We got one for Christmas as a result. Assembly: I used mini rocks and water to fill the hole required to weigh it down. It was a pain… if I could have found dry sand at the store that would have been a lot easier. When you have to tip it sideways occasionally to tighten the bolt- the plug leaks. So use sand. The sand won’t slip out.
Other than that my kiddo loves hitting this thing every time he walks by it or needs to blow off steam. It makes him feel manly and I find he is less emotional when he has access to easy physical exertion. It’s a family win. It is squeaky- but worth it.