There is nothing wrong with the Griffin tank. I like mine. But even the G2 deck has better flavor than the Griffin. The G4 deck blows both of them away.
Your call. But when you get the Griffin let me know.
ETA: the protank 4 isn't in the same ballpark as the G2, not even in the same league, same city. Two totally different levels of vape. You know an RBA doesn't compare to an RTA.