It's no more or less safe than any other similar pistol. If you ask me, and this may seem a bit harsh, anybody who expects a pistol to pick up any of the slack for them when it comes to safety probably shouldn't be carrying a pistol. When it comes to picking out a carry gun, it's all about your proficiency level with that pistol, not what safety features it has. Just my opinion.
That said, I carried the PPQ for a while and I'm back to a Glock. The Glock for some reason carries a bit more comfortably even though it's very similar in size (it's a 19).
"Intelligence is nothing more than discussing things with others. Limitless wisdom comes of this." - 山本 常朝