Had a PF9 and loved it, then got a P11 and realized what true love is. Sold my PF9 and will never look back. Slightly wider grip fits better in my hand. A 12 round capacity that has no competitors in size and weight. Adder the trigger shoe and the trigger is long but nice. Hammer block not an issue for me. Also no malfunctions.
You can also get S&W mags, and a small plastic insert that fits on the base, and have 15 rounds.
My experience with the P11:
I liked mine. Carried it for a while. But I shoot other guns. I was in a pretty active IDPA club back then, and decided to try it out. On the first string of the first stage, I couldn't hit the broad side of the barn. It took several shots before I got it right. Thereafter I did quite well with it. The trigger was so different from what I was used to, that it took me a while to adjust.
I got to thinking that had I been carrying that gun and had been forced to use it in a self-defense situation, the results would likely have been similar -- except it wouldn't be a game where the other guy was a clicking clock. If you shoot the P11 a lot --i.e., it's the gun you shoot the most -- I doubt this would be a problem.
But shot irregularly, and under stress, it might be an issue. The next time you take your P11 to the range,
see how you do with your first 3-4 shots. If you hit where you expect, no problem...
I sold the P11 and started trying out other smaller guns. I've had a bunch. I like the PF9, and the PF9 trigger is enough like my other guns, that it's not a problem. First shots, even after a long period of non-use, don't give me a problem.
A P11 with the PF9 trigger would be a "sure buy" for me.