Q215:

I have a feeling this may have been asked before:

Regarding Overchannel (psionic feat from Expanded Psionics Handbook), where it says "At 8th level,
..." and "At 15th level, ..." does the level refer to your class level, manifester level, or character level?

I'm inclined to believe it's Character level and my DM is willing to go by that interpretation, but knowing that psionics can be considerably more powerful than spellcasting I want to be sure.