You asked, we answered. I have indeed had experience with cheap ones and they often have a loud cooling fan that goes on no matter what the load is, they often make noise themselves (ugly high pitched whining sounds) and put out a******sawtooth waveform that is unlikely to play nice with your computer. I have had multiple cheapos, some would run a laptop, some would hang it up, not worth buying. If you are set on wanting a cig plug compatible one, maybe get a samlex pst 150 watt sine wave model. Still not that cheap. The morale of the story - I know you want a cheap one , but it's not worth the disappointment.