steph daviswrote a review of Mammut Smart 2.0 Belay Device on May 5, 2018
Familiarity: I've put it through the wringer
I like using a crag device that has a braking assist--I also like things that are simple and lightweight. Since it operates very similar to a standard belay device, there's never the confusion potential of holding it open when trying to brake-- I like this device so much that I started incorporating it into my Moab Women's Clinic. I did wonder how to use it if I wanted to rappel a fixed line: you can feed the rope in "backwards" of the normal direction (basically using it like a regular rappel device). It won't give you the brake assistance if you rappel this way, but it operates just like any other rap device. Another tip: when pulling out a lot of slack for a leader: hook your left thumb just under the lip of the handle and pull your thumb straight out from your waist area (the brake end will still be in your left hand) as you pull the slack out. This quickly becomes second nature, but my first instinct was to pull my thumb up rather than straight out, which is the most efficient direction. Great device, and it has become a staple for me!