The cushioned, slatted running surface is not the only standout design aspect of the Peloton. Most treadmills have buttons to adjust speed and incline. To change speed or incline on the Peloton Tread, however, there are two knobs (one on each arm of the machine) that you can roll forward or backward—or you can hit a button in the middle of the knob to jump to the next whole number setting. (If you hit the knob while at 6.5 mph, for example, the speed will jump up to 7 mph.) For most of our panel members, changing speed or incline using the knobs felt smoother and more natural than hitting the buttons that usually control these functions. Some of our panel members said that at higher speeds, the machine was loud and vibrated noticeably—which sometimes led to a shaky video screen. In CR's standard durability test, meant to simulate six months of use, our experts found that the vibration became somewhat more pronounced after testing. The Peloton Tread still performed very well overall in the durability test.