I am running a campaign, where all of my players want a psionics system, more attuned to 2nd ed but are asking about several others, as well. I loved Occult Adventures' system, but a few things were missing. What happened to the Psychometabolist? She could change shapes, heal herself and others, poison with a touch. Awesome class, that I think was unintentionally missed, so it points me in other directions.
I am ruling out some systems, because they are just not compatible, mechanically, especially, if they tell you that one system, is helpless against the other and vise versa. What was wrong with 3.5's original system, wouldn't it work with this system, can we not use it for some reason? I guess, these questions surmise my needs.