I carried a SIG P226 9mm for a number of years. It was 100% reliable, the accuracy was combat acceptable and it was reasonably concealable except during the hottest summer days. I liked it's flawless ability to reliably shoot a wide variety of ammo and I liked the affordable availabilty of 9mm ammo. Then I got to thinking that .45 is better than 9, so I "upgraded" to a SIG P220. The P220 was more accurate than the P226, but was not as reliable. Liking .45 cal. and being an experienced revolver shooter, I traded the P220 in on a S & W 625. Nice gun, but not the easiest to conceal. Then my friend, ChuckB, loaned me his Springfield Loaded so that I could requalify with a pistol. WOW! Even though I had very little 1911 experience prior to that, I shot a perfect qualification round: 100/100. So I sold my P226 and got a Kimber Stainless Target II last Christmas. I am very satisfied with this gun. After 7,000 rds. and 8 months of carrying, I have found it to be just as reliable as the P226, far more accurate than either of my full-sized SIGs, and easy to conceal in an Alessi Talon even on the hottest days, (meaning the least clothing.)
This is a long way of saying that currently I do not have a 9mm. Will I ever get another one? Probably; one never knows when the gun fairy will wave her magic wand in that direction.
Steve