I never got the grips with ImageFX and found it mostly un-intuitive to use - I still prefer ADPro when it comes to ARexx and batch processing - and I still run one of my scanners for simple black/white stuff with it (ASDG's GPIB, baby!, I just LOVE this red LEDs inside my A2000 ;-)).
Funny enough both ImageFX and ADPro run rather smooth even on my OS4.1 machine...and here ADPro is still there more used software of this two.