One of them always quits working.

This is the second set of these I've had..and the motor has quit in one of them each time. Guess I will have to send these back too. So disappointed. Edited to add: I am going to change this to a 4 star as the seller has contacted me with an offer of a refund and replacement product. This kind of offer goes a long way with me and hopefully the new set works well.

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