Handy and a real safety issue around the farm too. I once had a haltered horse spook while she was tied, flailing, trying to rear, was about to hurt herself badly. I pulled the knife clipped to right front pocket, flicked open, cut the rope - disaster averted.
One-handed (safe) opening and closing is so useful all around the farm I'd hate to use something else. I have several knives that work like this but my favorite is a SOG Visionary I. I like this one so much I'd be an emotional wreck if I lost it so I keep four in my "sharpened" box just in case, swap out the dull ones, and sharpen them all at once when needed. (I once practiced pulling the clipped knife into my hand, opening, closing, then reclipping onto the pocket - my best time was five cycles in about five seconds!)
JKJ