I don't think this has been answered
does the wm5.0 support custom words? as wm2003se lets you store custom words for spelling, but a soft reset clears it. is it persistant with wm5.0?
a couple of things I won't upgrade are:
BT stack: crappola M$ stack - no stereo BT audio
no usb mass storage support yet
some applications I'm using aren't wm5.0 compatable... yet.. ( even tho a couple of them say they do work with wm5.0
)