12v car tyre compressor.

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Looking to purchase one of these little marvels that plug into the cars 12v socket. But looking at the variable choice from 5 quid to 50 quid I have no idea which are good / bad or just plain dreadful. I don't really want to spend more than 20 quid but if that buys rubbish perhaps I need to spend more?Comments and advise please.

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Thank you.