[Lost One]

I had a character who loved to be a psionic. I remember a psionicist could get disintegration fairly easily and that character (not high level) made a hole through the 'big boss' I'd planned for an adventure. Ruined my fun!
I never got to use the mind challenge between two psionicists - that was the most difficult thing to grasp with psionic powers. I always let my players roll for wild psionic talents, too and a player once managed to roll 1% and get a control air or sound power.
Overall, psionics IMO were a 'refreshing' class because they were so different from yon mage or cleric.