Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Great little unit but must be used to function properly...

Terrific little starting unit for the price. The University of Minnesota uses a half dozen of these for the Motorist Assistance Program instead of buying the individual $5,000-a-pop industrial gas powered starting units. We have maintained a 96% success rate using both - so why spend the big bucks? These are smaller, safer - and they just work! They will lose the charge if not used regularly but that's to be expected. We've had great performance out of these.