I can't remember where I read it, but there is a story of a police officer out east putting 9 rounds into a guy before he put him down. Had many torso shots.I did not select the XDM based on capacity. I selected the XDM because it has shown to be very reliable, has a rail and is also ergonomically pleasing in my very average sized hands. I dont mind a larger gun since I have no plans to conceal the weapon on my person. That being said, a larger gun often yields more capacity. I welcome the additional ammo but it was not my priority. Speaking just for myself, if I have at least 5 rounds of something readily accepted as effective for lawful self defense, I dont fret. Less than 5 rounds of something of very low power... then i fret a little.
So forgive me if two such people came into my house if I am going to be prepared. That's 18 shots with NO MISSES.