Not the smoothest belay device
The new model 4 is super light and you have to have one if you're multi-pitch climbing or plan on rappeling. That said, it does not lower or rappel very smoothly. Not sure why, I've used it on super skinny 7.8 half ropes and 9.8 single ropes and it's still kind of jumpy. Works well enough and the light weight means I take it with me on multi-pitch, so good enough.