Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Useless on coarse hair

I couldn't work out why this shaver wasn't making any headway on even quite short stubble. Then I realized that the screen holes are very small, only fractionally larger than my (admittedly thick) facial hair.Bottom line: this might work on fine hair, but if you have chin-mounted tree trunks like me, forget it.