Black Diamond ATC Guide Review

The performance difference between the ATC Guide and the Petzl Reverso 4 is closer than we could have imagined. Both devices are smooth and reliable when belaying a leader or rappelling. They're also reasonably priced and durable. The differences amounted ultimately to only weight and auto-block resistance. Although the Reverso 4 is an ounce lighter, over the lifespan of either device, we believe the ATC Guide's lower auto-block friction will actually save most users more energy. For this reason we consider the ATC Guide our top pick for multi-pitch climbing.