We've had it for about 2 weeks and it works just fine. The only downside so far is that it has a loud buzzer when it moves and it's a bit annoying. Also, 10 kilos is a bit heavy for a child to carry. Other than that, it's great.

A classmate of my daughter had it and she has been using it daily for a year now and it hasn't had any issues. After my daughter saw and tried it, we bought it this year (one month ago). I don't have any other experience with a Hoverboard, but my daughter is thrilled with this model.

It has LED lights for night use (a bit flashy maybe, but kids really like it) and a built-in Bluetooth speaker so it can connect and play music from a mobile phone - *annoying inside the house if the child feels like it while you don't.
Of course, you can connect first to the Bluetooth, annoy the child, and make it play Zen music to relax yourself as much as the child enjoys it. :)
Good battery life and relatively fast charging.
It comes with a carrying bag.
There is a Greek representative and the French manufacturing company seems reputable - at least from its presence on the internet. The product, of course, is Made in China.
2-year warranty - unlike some other Hoverboards that only give you 6 months!
Make sure to inform yourself before purchasing any Hoverboard, both about the warranty and possible service if needed.
I will come back in a few months for a more comprehensive personal assessment.