You should pick up some ejuice and fill up the cart. You can use them more than once. If you like buying the prefilled ones thats fine, its just a little more costly. The PR111 looks like an KR808 ( thats the type of ecig)
Many members here have been smoke free due to vaping. We have also had members who used vaping to quit cigs and ultimately quit vaping. Your future is in your hands.
If your V2 is working for you right now, you might as well stick with it. It sounds like its keeping you off the stinkies and thats what really matters. Sure there are "better " units out there but in the end you arent smoking and thats the goal.