my last change I tried ATF Type F, I don't really notice any difference from formula +, other than it's easier to find neutral. I was told that it prevents the jump you get when starting when cold (main reason for trying it) but it didn't make any difference in that. It is about $4.00/quart cheaper. I will probably stick with it unless I find something else that helps the cold start jump.
Formula+ now but will go to either Rotella 15w-40 dino or 5w-40 syn at the end of season change. Change it once a year but never has more than 6k on it...