I've had a P-11 for several years. I fluffed and buffed it (ala
WWW.KTOG.ORG) before I fired it.
It has been unfailingly reliable, durable, and accurate. I've shot it a lot -- several thousand rounds throught it.
That said, I find the P-11 particularly difficult to shoot well. I shoot a lot, with a lot of different guns. I was always impressed with the accuracy, when shooting at targets at the range.
Then I joined IDPA.
I've shot the P-11 in a couple of small, local IDPA matches. I usually do pretty well in them, placing high in my class if not winning it, when shooting other guns. I have had best times, overall, several times in the match (not just in my class) with those other guns.
I do poorly with a P-11: better some of the shooters, but nothing to brag about.
Recently I bought a Star Firestar Plus. Similar size, 8-9 ounces heavier, but still not a burden, similar capacity. I won one of those matches with it, and it was only the second or third time I had shot the gun. A marvelous single-action trigger, beautiful fit, good ergonomics.
If the P-11 is your only gun, and you shoot it a lot, it'll probably serve you well. If you don't shoot it a lot, or if you must shoot at distances greater than 20', then you may have a problem if or when the stuff hits the fan.