Only time I use CGFX is when Picasso96 doesn't support the specific hardware. I remember there was some speed gain although not much and I got rid of a videobug with CGFX4 instead of 3 on my old BVision. But I'm not the person to talk about if it's worth it... have CGFX4 here on a CD and I still use P96 now on all my machines (might change soon when/if I do the CSPPC+CVision combo).
