Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Didn't work as advertised

I picked up the PAC SNI-1 to solve an alternator whine problem, same as the first reviewer. However, this product did not work as advertised for me at all. It failed absolutely miserably. So, maybe you'll have better luck than me (like the first person here), but be forewarned... I wish I'd been.