I wouldn't trust this system with my worst enemies life, let alone my own. Are they even legal in Colorado and such states? What tests back up there claims? Are they DOT approved? Sure they may give some grip while driving, but what would keep the chains under the wheel when braking? Friction might pull the chains from under death. Also, if someone isn't getting out to inspect them eveytime, how do you know hey are functional? The actuator may not be engaged, chains might be broken off. If you have a blow out, will it rip he actuator off? If you are driving through fresh snow, will the chains freely move under the wheel? Id rather take the time to install the chains and cables. If the roads are to bad, then I'm sitting some where safe. It just seems to gimicky to be a safety device. I guess time will tell.