I have used TENS units for over 30 years... I possess an earlier version of this unit (however my older one is a TENS/EMS unit). I love it so much I wanted a backup TENS. It works marvelously and I would recommend it to anyone. I can now use the EMS for Post-op Knee replacement surgery/recovery; and use the new TENS unit for pain control (without having to switch the settings).
Having independently adjustable parameters and easily sourced adhesive pads provides much more utility than some other units. The price point puts this unit in reach of most people.
Unit is easy to use and has helped me manage my chronic neck stiffness and pain.
Works great, simple to use, very well made. Very happy with it!