Has anyone here managed to create a first person character controller using physx?

I've been using c_move/c_trace for a while now but wasn't able to get a solid movement code, yet.
Mostly because of the weird ellipsoid collision-behaviour that comes with c_move and c_trace.
So I tried physx which should offer a collision system that is much more stable and versatile.
(and supports capsule collisions... finally)

Well, turns out that the character movment in this physx implementation is pretty wanky aswell.
Sliding along walls and wall-collisions don't always work as they should. Corners or slopes are even worse.

Soo.. have you got any tips that could help me?