I bought both, the battery powered one is much better quality and feels solid, the mains version is horrible cheaply made (like poundland quality) so I returned it. I actually use the battery powered version (in conjunction with a handheld dyson) to clean out my PCs, it's not as good as using air duster but it's pretty good.
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I wonder if it has enough puff to blow the dust out of my PC heatsinks. :smiley: