Pymel incompatibility list

Hey guys,

maybe you are from time to time facing the same situation:
You are scripting a tool for Maya and you really want to rely on PyMel, instead of maya.cmds or the Python API,
since its so convenient and fast.
But many PlugIns are not that compatible with PyMel and give random crashes, whenever you import it.
One prominent example being VRay 1.5 for Maya…which was a real bummer. (Its officially fixed since 2.2)
Another suspect i currently have is FurryBall.

So i wanted to open this thread, for everybody to post his compatibility experiences and for people who start a tool, to look
at and make a decision wether or not its save to use PyMel.

PS:Does anybody have any experiences with ArnoldToMaya or LBrush and PyMel?

Update:

-FurryBall 2012 seems to be incompatible with pymel (Reproducable crashes on import)

cgfxShader gives me tons of problems and crashes in PyMel (Maya 2011 x64). Maybe maya cmds as well? I need to use pymel.mel.eval.