One for Parents - I need your wisdom

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I recently found what i think is a unique and fantastic product for children between the ages of 2-10 years old. I myself don't have kids but have a number of neices, nephews and close friends whose children i buy presents for at birthdays/christmas etc. I am impressed by this cool new idea and think it will give kids a fun outlet and save my friends walls from being attacked. I like getting unique gifts but not having kids I just want some advise really do you think that this is a good product? Will the parents be happy about it? It seems big will that be a problem? Do you think it's safe for kids? Are they likely to use it? How much would you pay for something like this? I don't want to get robbed alot of kids items seem to be very expensive these days how much is to much? would you buy it? How long do you think it'll last?