EDC: SIG P938.
I carry mine, and it is a great gun. Based on my experience, and those of some others with whom I've corresponded, expect to do a little "sorting" if the gun is new, or the previous owner didn't. Before my gun would run with an acceptable level of reliability (one minor bobble in 800 rounds), I had to replace the recoil springs and mag springs, adjust the extractor and dimple the slide stop. Unless the gun is new, with the pouch, manual, etc., I'd say the price is on the high side. The Mk. V is the most common of Combat Masters, and I think $550-$650 is more like it for a used gun. There's a used MK. VI, one of the more rare and desireable models, at a gunshop down the street, with night sights, for $550.