Many view Psions as just another list of spells/powers, YAH! That would be the point of having them introduced into your campaign. The more spells to choose from the better. Wizards are defined by their spell selection, or lack thereof.
1) I have only played a Psion Keneticist in 3.5 and so far he is a walking arsenal of energy. Great for the BIG BOOMER! He is the artillery of the party both long range and short, and has the staying power to finish a fight. His ability to alter the energy source at the time of manifestation is irreplaceable (fire, cold, electric or sonic). Only the Warmage or an evocation based Sorcerer can hold a candle to a Psion Keneticist, but they have either slower spell level progression or an extremely narrow spell choice. Wizards, clerics, are forced to memorize spells with the feats they wish to alter them with well ahead of time. They are forced to predict the future and that has made for terrible inefficiency in our campaigns in some cases leaving our party Wizards running for cover unable to cast their big attack spell. My Psions ability to augment his powers, choose the amount of damage di, add to DC, effect additional targets, spontaneously apply feats like widen power (my favorite for mass damage) all for x amount of points, LOVE THE PIONT SYSTEM!
So put me down as a advocate of the EPH!
Malum Fama Este
As he steps off of the soap box