Instruct: Classify Amazon reviews into positive or negative sentiment
Query: kegelmaster

I used this product regularly (3x per week) as instructed in the product DVD. One year later, the product broke in my hand as I was tightening the knob with springs in place. I returned the product to the seller and never received any acknowledgement during the last 6 weeks. The product worked well but doesn't last long for the cost of the item. I would strongly recommend against purchase and give this seller a very low rating for poor customer service.