"The ActiGraph accelerometer is the only accelerometer and company that I would personally endorse. As a physical activity assessment device, it has the most validity and reliability support within the scientific literature, and is used across the globe. In conducting multiple trials with this device, both small and large scale, we have always found it to be robust, easy to use, and tolerant for our varied subject populations. The software has dramatically improved over the years, as the company has listened closely to the needs and wants of consumers, and the directions within the research literature. I am continually amazed by their customer support, fast, responsive, and extremely helpful with a genuine desire to help. When asked, this is the device that I would always recommend to individuals who seek to assess physical activity behavior."