Anybody else like the fractional base attack and base save bonuses to keep multiple plus 0s from going nowhere? I sure do. I also like the magic rating system. Maybe I just see more multicasting than most people.
Psion has definitely convinced me, as if I wasn't tempted before, to buy the Second World Sourcebook when I have the money. I'd really like a class-based defense mechanic, but the UA version seems like merely a workable solution to a problem that could be dealt with elegantly. I'm probably going to want some damage-soaking armor to go with it, and reserve points to cut the down-time.
I missed the level-check for turning undead. I definitely need to check that one out. I might consider some version of the Variable Modifiers variant for more excitement at high-level play, or to replace that mechanic from 4CTF...
And, of course, weapon group feats, action points, the metamagic fixes, the multitude of class variants, bloodlines, generic classes, and racial classes are all nifty nifty things to think about.
-z