Since the 0.6.X firmware update, RepOne Sensor can navigate reps via tilt (click to see a tutorial). In our previous VBT sensor, OpenBarbell, as well as other products that have a striking resemblance to OpenBarbell, there are mechanical buttons at the top of the unit. These buttons are prone to failure as they're in the landing zone of a potentially fast-retracting tether. Our tilt navigation allows the user to avoid downtime via broken mechanical buttons.
If you're looking to navigate reps more efficiently, we recommend the free RepOne Personal app or StrengthOS.