As a software engineer and cyclist, I am big on numbers and data. I've used a number of speed/cadence sensors by now, and I am convinced that Wahoo make the absolute best. Other sensors can be really fidgety and irritating to setup as they rely on a magnet passing by a sensor on each rotation. The Wahoo rpm speed sensor on the other hand just attaches to your rear/front wheel hub and measures each rotation with some internal sensors. It's sleek, easy to install and works great.