air pump thingy to clean dust off lens and sensor

Hi all, I want to buy one of these. is there a particular brand that is best? I read an article on the top 10 accessories and the third was the Giottos AA1900 Rocket Air Blaster. Is this the one most people get?

http://digital-photography-school.com/13-popular-digital-camera-accessories-among-dps-readers

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http://500px.com/baneling
Canon T3i
Canon EF-S 18-55mm f/3.5-5.6 IS
Canon EF-S 55-250mm f/4-5.6 IS