If you are lookin into auto locking tube devices check out the Mammut Smart 2.0 or Jul2. I have a smart 2.0 and it works great. I tired the Black Diamond Pilot, and it doesn't lockup with my Canyon Elite 9.5mm using any of my carabiners. 's. Me being overweight and the fairly slick sheath on the canyon rope doesn't help. I want to pick up a Jul2 to try.
The Mammut Smart 2.0 locks up and hold my just fine alone, but I back it up above the device at hunting height. Rappel is very easy and smooth.
This video shows various devices ability to lock up and catch you should you fall. Had I seen this before buying the BD Pilot, I never would have bought it. You have to remember rope diameter and sheath material matters a lot. A lot of stuff won't work properly with the slick 8mm ropes commonly used these days. The position of the tail end of your rope matters a lot of as well.