PBusardo didn't seem to think too highly of the iPV v2.
Not sure what some people's attraction to replaceable batteries is. Personally, if a device lasts me two years before I move on, it's longer then normal. And so far, I haven't had a single device who's batteries failed me, while I was still using it day to day. In fact, I've been vaping since 2009, and while I've had some batteries fail, I haven't had ANY device with built in batteries have those batteries go bad on me.
The iStick has a 4400 mah battery, which should last well over a full day. It has micro usb charging, so I can always charge it for a short time while in the car, or at the computer, or nearly anywhere, as I have micro USB cables all over the place.
Replaceable batteries also means you need to purchase the batteries separately, which adds to the cost.
I realize everyone's tastes and preferences are different, but for my money, give me a built in, long lasting (high mah) battery any day!