You get a get a +2 bonus on caster level checks made to overcome a psionic creature’s power resistance.
This bonus stacks with the bonus conferred by Spell Penetration and Greater Spell Penetration. Moreover, whenever a psionic creature attempts to dispel a spell you cast, it makes its manifester level check against a DC of 13 + its manifester level.
The benefits of this feat apply only to power resistance.
The bonus does not apply to spell resistance. This is an exception to the psionics–magic transparency rule.