here are my random thoughts.

-alot of TAGs can c/r bluff you, but only a select few can make a pure air 4 bet bluff. clicking it back can stop them from check raise bluffing you when you are cbetting.

-the opposite is true for the really tough tricky players. alot of times they can 4 bet bluff and its great to click it back with strongish mediocre hands like TP2k or whatever, because they can guess that you would never do that with a very strong hand. then they shove and u call and its funny.

-its a great way to raise for info. once everyone starts progressing in their poker level everyone starts realizing how bad this is. but once you get on a higher level, it starts to make sense again.

if raising for info gives you a piece of info that prevents you from making a huge -ev mistake later on in the hand by sacrificing a relateively small bit of ev up front, then raising for info cant be THAT bad.

-it can buy you free cards, just like in limit. its great for when you don't really want to commit your stack with a draw but dont want to lose initiative because you dont want to be bluffed off the hand.

-its a great way to build pots early on vs fish without really scaring them off.


to use it though u have to know about who you are playing against. this means you have to know how they play and what they think of how you play. its all about hand ranges, after all