I bought 4 of these. 2 worked as advertised for a while, seemed great, then 1 recently failed (one of the two fans stopped working). 2 (1 refill) were unusable right out of the box. One had a fan that hit something too loud to use. On the other, only one fan worked, the other started once, then stopped and never started again. 50% error right out of the box and a subsequent 3rd block error with an overall error rate of 75% indicates extremely poor quality control - do they even test these things before shipping? I will never buy again and the question is will I trust this company in the future. They made a decent product but seem to have lost their customer focus and good quality.
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