Not a policeman any more, just a filthy armed guard.
I carry one. I like the medium / small one. The large is too much handle for me. I got the half serrated / half smooth blade; best of both worlds. I have it stuck to my inner belt. If something happens, even if the gunbelt gets stripped, last ditch is right there.
It lives behind my radio on my left side, where it blends in, the external vest kind of rides over it, too.
Whatever you do, think hard before you put something like that at 12 oclock. I'm not going to spell it out on an open forum, but, really think that decision through.
Not one person has commented on it. And, they've noticed other things I've tested out (one of the indulgences of not being a patrolman anymore is that you can test different arrangements and equipment without worrying if it will fail on the side of the road).