I think it's a great feature, though I can't speak from experience, just what I've seen. One other thing to note is that although it's a new technology, it's very likely it could be reflected in your insurance premium. I know when I was shopping for cars I got a quote for a base Volt and was floored at the estimate, but knew I wanted one and figured the money I saved in fuel cost was offset by the extra premium cost. However, when I actually gave them the VIN for my '13, which has both safety packages, the actual cost dropped significantly (1300/yr down to 700). My understanding is that it was due to the safety features.