It's good but too light and skinny.
I am so used to using my climber's carabiner due to its sturdiness and strength. When I got the Mehlville, I was surprised by its lightness. I do hope it's strong enough to last a lifetime. It's thinner than my Black Diamond Neutrino carabiner. The two features of the Mehlville that I like are the bottle opener and the locking mechanism, which places all the keys in one place. That's great that I don't have to worry about losing my keys, which I sometimes drop a key from my Neutrino carabiner.
I hope they make the next Mehlville, a version 2, that's thicker, has some weight (so I know it's there), and has the same strength as a climber's carabiner.