I’ve signed up to get one free in exchange for my data. An organisation wants to study driving habits of an age group I fall into. It sounds like a black box without the downsides. It measures driving habits but doesn’t punish for what it sees as bad driving like a black box does.
I consider myself a safe driver but will always consider advice for improvement. I won’t necessarily obey the device’s advice as I have heard of similar devices chastising drivers for accelerating in the name of safety - e.g. while overtaking or up a slip road. That said, I am interested to see what it says about my driving, especially when it comes to fuel consumption, as that has a tangible impact (on my wallet).
At the end of the day, I can stop using it after day 1 if I want to; but if it helps me spend less money and drive more smoothly and safely that has to be good.