While I am not an expert at climbing (I am a master of falling off things, though), I have found this carabiner to be of excellent quality. It is solid and substantial (as another reviewer noted, it is bigger in real life than it seems in the photo). The mechanism is spring loaded, so it snaps into place automatically. The locking mechanism is manual, but very easy to use one handed with a tiny bit of practice. I found it easy to work even while wearing gloves. I have not fallen off anything with it (yet), but I have faith in it.