Only used once during a 9 hour drive to power laptop from wall outlet and cell phone from USB. There were absolutely no problems and it seemed to work fine. The only reason I didn't give it 5 stars is that the cable that plugs into the cigarette lighter doesn't fit very "securely" into the back of the inverter. It appears to be able to trigger when faced with severe vibration or accidental bumps (a rubber strap would likely solve this potential problem). My cup holder was just below the cigarette lighter, but if your cup holder is in the center console between the seats and the cigarette lighter or power is on the dash, the cable may not be long enough. I'm not sure about the length, but it's better to check before you buy.
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