The problem with that is that this device and insurance in general doesn't factor in driver ability. Sure I brake harder and later than the general driving population and I corner like my car is on rails. But 1) I actually have a decent amount of race track experience where I actually AM controlling the car at the absolute limits, 2) I never come close to those limits on the street, 3) I maintain my car significantly better than the average vehicle on the road, 4) I have far better tires than the average vehicle on the road, and 5) I have a much lighter and easier to control car [Miata WOOHOO] than the average car on the road.
However none of my 5 points factor in on insurance. Why would I let them track me to see that my car brakes harder and corners faster than the average car if they won't factor in the driving abilities and vehicular factors that make me safer than the average driver?
From this study summary:
The belief that increasing skill would reduce crash rates has seemed to many too obvious to be worth investigating. Such a belief reinforces the view that driver education must increase safety, even in the face of so much evidence that it does not (Chapter 8). It is widely held by driving aficionados that high-skill drivers are inherently safe drivers.
This was examined directly by comparing the on-the-road driving records of unusually skilled drivers to the records of average drivers. The investigators obtained the names and addresses of national competition license holders from the Sports Car Club of America. They compared the on-the-road driving records of these license holders (referred to in their paper as racing drivers) in Florida, New York, and Texas, to comparison groups of drivers in the same states matched in such characteristics as gender and age.
The results of the study are summarized in Fig. 9-1, which displays the violation and crash rates for the racing drivers divided by the corresponding rates for the comparison drivers. If there were no differences between the groups of drivers, these ratios would all be close to one, whereas if the racing drivers had lower rates, the ratios would be less than one. What is found is that in all 12 combinations examined, the rates for the racing drivers exceeded those for the comparison drivers, in most cases by considerable amounts. Thus, on a per year basis, the racing drivers not only had substantially more violations, especially speeding violations, but also more crashes.
This is supported for me anecotally: I have several friends who spend a lot of time on the track, and are highly skilled drivers. They all drive like total assholes on the public roads.