I wouldnt call it pain, at least not in my experience. I've had like a background hum kinda thing, a nagging, or irritating thing going on. i was never really in "pain". not even the few days following my hospital release.
there is definitely an awkwardness the first time you realize food is hitting it and it is full. didnt hurt, just wierd. i dont know how to describe it. you'll know when it happends though. when its too full, when you eat something the pouchy doesnt like, when you eat something it does like, you will get to know your pouch.
I use my c-section as a measure of pain. this was NOTHING like that. which i was grateful for