To Hover Board or NOT to Hover Board?

For or Against? My daughters wanted a hover board so badly that they actually decided to work together to earn the money to buy one on their own and SHARE IT! This was the first cooperative moment I’ve experienced with them. They found one on ebay for $175. I thought, “there is no way this thing will work”. I’ve heard of people paying up to $500 for these things! We bought the hover board and…so far so good. They love it! It works perfectly. I’m still afraid to leave it…