I half-considered getting one of those (I'm in the UK), but the initial cost was expensive and they were single-use as in they needed to go back to the manufacturer to be reset after being triggered which was an additional cost.
I'd be dead scared of false positives riding in one. That might be harmless at a speed slightly above pedestrian, but my speed range does not end there.
Sportier drivers may wish to brake and accelerate simultaneously (rev matching, weight transfer tricks). Normal cars just cut fuel when braking to avoid two-foot drivers burning their brakes.
We have used two boost versions built in different namespaces. Most of it works but there can be Fun if two now-independent versions of the same funtion use the same resource.