This was a good tread mill for my purposes... not too many "bells and whistles". It had a low pitched tone every time I took a step when it was set between 3 and 3.5 mph. Also I'm having a problem getting the belt adjusted to stay in the middle of the track. I tried to call customer service concerning the "tone". There was an answering machine. I left my number and the nature of my concern and have never heard back from them.
- Was the product free of any manufacturer defects? Don' know