I've played Psion into Meditant before. The buffs are pretty nice in the early game, but the standard action activation is really problematic if you don't have a surprise round or another way of knowing that you'll be fighting.
Originally Posted by JaronK
Frankly, a Wizard can suck even more than a Fighter could ever dream of sucking. A Fighter can stab himself to death, but only a Wizard could Plane Shift to some horrible far realm to be tortured for an eternity of insanity.