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I would not buy based only on an overall star rating. Like JSWolf, I look at low-star reviews to see what the problems might be - did the product break after a few days of normal use, or is the reviewer obviously an idiot who didn't read the description and had unrealistic expectations?
Also, as others have already said, I don't rely solely on store reviews but look for other sources of information - either online or IRL. If someone I know has a product like what I'm looking for I will ask them if they like it.
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