The knife isn't any easier to open than any of my same-side knives are. The biggest feature for me is the lack of half stops, and the light pulls. I have thin, flexible nails. Not brittle; FLEXIBLE. Half stops introduce a snapping action to the opening of the knife that makes them a nuisance to me. The light pulls mean I can open the knife easily even if my nails are a day or two too long, or even with gloves on. I can open the knife safely even with oily or wet hands, which isn't true of any other nail nick knife I own. With the others, if my hands and the knife aren't bone dry, I may as well be holding a knife glued shut with epoxy. I actually bought this because of its resemblance to my favorite vintage Schrade, which I love, but cannot open dependably.
I've never bought the idea of a half stop as a safety feature. I have to close the knife to 17 degrees before it will start to shut. There's absolutely no way I wouldn't notice. But I HAVE accidentally bumped a knife enough to almost make it close to half stop, and if I had, instead of staying at, say, 150 degrees, it would have snapped to 90, cutting my finger.
Furthermore, half stops make a knife impossible for me to close safely one handed, turning one smooth action into two snappy steps. Not what I like when at the top of a ladder holding a roll of filter plastic in one hand.
I've heard complaints of lazy opening and closing snap on some 81 knives, but mine is quite snappy and satisfying, despite being light.