These are stupid fun. Sure, you look like a dork riding one, but you won’t care. There is a learning curve that is fairly flat. It will take about 15 minutes to understand how it responds to your actions and for you to stop shaking trying to balance when you do not need to do so, because the segway will balance for you. About another hour to explore limits and capabilities, and after that, a few hours to build confidence. All the while having fun.
But do be careful, try not to turn while backing up, the behavior is not what you expect and it can throw off your balance (I learned that the hard way). If you do ride this indoors, mind the wheels, for if they bump or rub up against something (wall, baseboard, door), it will startle you and interrupt your balance for a moment.
And to clarify, “Certified Refurbished” does not mean what you might think. Imagine that some parts get damaged, scuffed, dinged on the assembly line, and the manufacturer tosses them into a reject bin. Then later on, the manufacturer takes those parts from the reject bin and assembles the product from them. The product works, but looks like it has had a rough time. That is Certified Refurbished.