My partner just came across a M6 very, very cheap. He brought it to work and we were able to play with it for awhile. Anyhow, now I kind of have an itch to buy one, but I just can't talk myself into the expense. And, I wonder if I would carry it on duty. What are the advantages of one and what are the disadvantages of one? Swapping holsters is not that big of a concern.