If my memeory servers me correctly:
Level 1 force grip: Hold an enemy in place without doing damage.
Level 2 force grip: Hold an enemy in place, levitating them, doing moderate damage.
Level 3 force grip: Holds an enemy under you control (so you can throw them about

) and does decent damage.
Its a shame:
spoiler:You don't get grip at max level until so late in the game
