Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Manufacturer will not sell replacement parts!

The ES-6000 is indeed a powerful unit, but the case started breaking apart after a few years. First the sides where the battery clamps attach fell off, then the center handle broke off. The company refuses to sell replacement plastic case parts, and instead only offers a "refurbishment service" which costs as much as a new unit. With the clamp holders and handle missing, there is no place to safely store the the clamps (which are always "live"), thus making the unit in this condition extremely dangerous and unsafe to use.