I briefly played a psionicist with Ken's rules in a campaign a year ago. I needed another character while the party was split up.
The system has a definite sci fi feel to it, but for us this was fine as both myself and the DM have issues with the 3E Wotc system. It was a Planescape game so the otherworldly flavor worked fine.
To be honest, I think the system may be underpowered, at least when compared to a spell casting class. You have to make skill rolls to activate some of the feats/powers/skills, (of course some skills are essentially psionic powers). And if you fail to activate them, you have to wait, sometimes minutes if I recall, to try again.
On the plus side, no power points and no psionic combat modes. That alone was leaps and bounds better in my opinion.
If the situation in our game lasted longer I would have been happy to continue to play my psionicist, if only to get a better feel for all the differences.
You just have to accept before you begin that it is very much different in feel and mechanics.
