I can't tell any difference between them when I'm using them. I don't use the CC or boost, and get the same ol' same ol' Provape performance on all of them.Right on, smart thinking. Besides the extra 20W is anything else improved?
The lowest a 60W will go is 5W, so if for some reason you had a really high ohm coil, you might run into an issue there. The 40W goes down to 3W at the low end.