Instruct: Classify Amazon reviews into positive or negative sentiment
Query: This has been a nightmare.

The treadmill worked great for about five months and then the motor started smoking. Customer service sent me a replacement motor and within 2 days it started smoking again. I called three weeks ago and they said they were sending a service technician...they never came. I called again. They said it was a glitch and that they would put in another repair order and I would hear from the repair man within three days...I never heard back and they never came. I called for a third time, once again they said there was a glitch in the work order. They said they called the repair man and he would call me that same day to set up a time for service...the call never came. I am going to call back on Monday but I bet the same thing will happen. I will never buy another Keys Fitness product again. The treadmill isn't well built and the customer service is a disaster. Please do yourself a favor and buy another treadmill.