Finish, feel in the hand, ease of use, tidy 510, big fire button that needs a central push, good battery life, they are all the good features of the 120 and 150 also (apart from the bare metal versions of course).
Like you (and many others) I couldn't care less about the "curve" setting and TC.
What you could do is when firing, check the voltage displayed to see if it marries up with resistance and watts?
Maybe also try out the same atty on the V2 and say the RX? at the same wattage and see if they feel/hit the same?