I've owned a P-11 for a number of years. Put several thousand rounds through it.
I never found it comfortable to shoot.
The recoil is painful, and the trigger hurts my finger, with or without the trigger shoe.
As for the trigger pull - the biggest problem is that it's inconsistent. The pressure required increases, as you pull, and doesn't increase smoothly, but with a noticable "knee".
And one thing that does bother me is the lack of a safety. I don't mean lack of an external safety - I understand the choice of not having an external safety. Revolvers have worked that way for more than 100 years.
The P11 lacks any semblence of an internal safety, as well. The only thing that is keeping the firing pin away from the primer is the spring. It's a design that is prone to drop-fires, and while that doesn't bother me in a target gun, it does bother me in a carry gun.
On the other hand, it's always been absolutely reliable for me.
The PM9, on the other hand, is smaller, nearly the same weight, is a bit easier to carry, and much more comfortable to shoot.
It's more accurate, the trigger is far easier to control, and it has a firing pin block that makes it impossible for it to discharge when dropped.
I'm not going to slam the P11 - it's a remarkable little gun for the money. But to me, the PM9 is worth the extra money.