PIF? Lol, You'll be very happy with your kayfun, Just get a syringe with a blunt tip needle to fill it instead of going the top fill method which I never got used to/liked at all.
As far as the dripper, your wicking is what holds the juice so if you have a good wick setup it should last you a while before you have to redrip. That also depends on the coil/s you have in there vaping all the juice away. The way I wick my coils, at .45 dual coils I get at least ten puffs at 12mg. I can take some burly hits to and it still lasts me.
Yep, someone is sending me their unused Kayfun 3.1 as a vapeversary "gift". Pretty awesome, huh?
10 puffs?? No, that wouldn't work for me. That's what I get from my dripper now, and it's a pain. Right now I have a 1.1 ohm coil on it and vape 6mg. Yes, I like the flavor a bit better than my rebuilt/rewicked coils in my Evods/Aro/Protank, but I'm something of a chain vaper and dripping really isn't doing it for me.