Useful Tool but the knobs are too hard
Great overall product, just WISH that the company had a tight rubber cover for the knob ends for better grab and more giving use in some of the delicate areas such as the mid, upper back paraspinal muscles and neck trigger points to make it an even better product.  Hard Plastic is Hard Plastic and has no give. Overall this has been an important product for some of the back pain patients to help give them more self control over their back issues to help keep them out of the office. I like the ergonomic design which makes it easier to use than its main competitor out there.
Rating: 4 stars