I have used this carabiner for my ATC guide for the last year now. I got it because it is round stock which allows it to last longer and run smoother in guide mode compared to an I beam carabiner. This is the lightest full round stock carabiner I have been able to find and I really like it for what it is. The only dowsnside is that it takes longer than normal to screw. This isn't a major issue if you are not wearing gloves and if the screw is running smoothly because you can run your whole finger along the screw 3-4 times to lock and unlock it. If you are wearing thicker gloves or grit has gotten in the threads, it makes it much harder to do this.