these units are not going to lower your rates. I would never voluntarily offer to give away this sort of data.
think about how you enjoy the capabilities of your car, everytime you stomp on the excelerator it goes down as aggressive driving, do you really want that?
Not to my insurance company, who is going to use it to justify either higher rates or denying coverage. Read stories from people who have used hands-on auto insurance like this, or Tesla's. You go one mile an hour over the speed limit sometimes and you're penalized. You stop suddenly to avoid an accident, you're penalized. You accelerate rapidly to safely join traffic on a short on-ramp, you're penalized. They lure you in with promises of discounts, but it ends up being worse. You just might not notice how much worse it's become until you submit a claim.
