Very Worthwhile
Its simple to use. Drag an image in, mess with it, and pull it out to the desktop.
I like the effects. Ive used the bulge to simulate a "Mega-mind" portrait for facebook. Ive used many of the others(ASCII Art, City Lights, Comic Book) to create images for cards, Ive used the Color Controls to create different renderings of the same photo, sliced them and put them back together for a Warhol effect.... and I -really- like the Kaliedescope effect.
2 small drawbacks (remember the price before you consider these to be "negative"): You cant combine effects unless you pull the image out and put it back in again .... and it would be awesome if Kaliedescope was somehow useable as a screen saver. The rendering is fascinating to watch.
vjdjr about
Composer FX Image (Lite)