VS.
To set the Rhythm up with TrainerRoad, first you turn it on by pushing on the top of the device, then in the program you go to devices and select it, then forget the other one...Easy Peazy.
While the Rhythm was set up to the Mac and TrainerRoad, the Garmin soft strap was set up to my Garmin 810, tried and true. This way I could check the active HR, the Rhythm on the TrainerRoad on the TV, and the Garmin on the Garmin.
Accuracy:
The active accuracy was spot on. The Rhythm actually gave me more variation of HR during activity then did the Garmin, and adjusted more quickly to changes in HR. I was on a recovery ride, so I did not bring my HR up too high, but elevated and lower it several times in the short 25 minute ride. Each time the HR was within a beat of each other while moving up and down, and alway the same when a stable pace was achieved.
After the ride comparison: TrainerRoad does not display maxHR therefore that data point was out, however the avgHR was spot on at 115bts/min. So good new for those of us who hate putting on a chest strap...The Scosche Rhythm matched the Garmin Soft Strap at every turn! Nice!