I have just used Fat Gripz original on Press, pull up, close grip and skull crushers...OMG my forearms feel great.

Has anyone ever used Iron Bull Grips, I am thinking of getting the 2.5 and 3inch, they look like they will fit better in your hands.
My thinking is to use the 3inch on all pressing movements and the 2.5inch on everything else. What are your thoughts?