Yeah, I have one of those . . . helped a friend build a deck using special order Trex [3 week waiting time for an order] and I measured the last piece wrong and cut it wrong. I freaked out.
I still have a piece of that displayed prominently in my workshop (garage) with a sign on it that says: "Are You Sure?"
Full Disclosure: I still make mistakes, but I'd like to think . . . just not as often.
Oh, and my friend is still a friend.