It's interesting to be honest. I did a small spine tap on the table first and found that I could easily press the blade closed like a slipjoint. I almost resigned myself to dread when I cut the paracord I needed, heard a click, and found that I couldn't press the blade closed anymore. I opened the knife again, pressed the spine, and heard the click again, then found the blade locked up solid as a vault. I can't say whether it's that way by design or whether it just needs some breaking in given that this is a unique approach to the traditional back lock.
But since it engaged when the knife is in use(from light cutting no less) and the finger choil would catch on my finger before the blade does, any potential threat is essentially nonexistent, so I would give the lock a 10 anyway. I also find it to be convenient if I only flip the blade out to show it off as I can then close it one-handed(otherwise impossible while the lock is engaged).