Had it for a week, does what it says it does, but make absolutely sure the clips don't touch anything when it's attached. Positive alligator clip got close to inner hood liner and burned. Flamed up. Burnt the red plastic boot off and if i didn't blow the liner out (I freaked!), my vehicle would have gone poof! Pilot error? Bad design? Who knows.Edit: Just called Schumacher and they're replacing it, no problem. Upping my rating from a ** to ***. Thanks Schumacher.