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In my opinion, it is worth having the software.
DPP is an excellent RAW converter with top notch color rendering.
Autocorrection of lens aberrations is easy and quick.
Noise reduction is perhaps not quite up to standard, but is decent.
Zoom Browser does an excellent job of resizing JPEGs on the fly with good
image quality and realistic sharpness. It's great for sorting through pics
in hurry. And if you've ever wanted to show your pics in a slideshow, it
does a very good job of that. Finally, it is very good at displaying
HD Video from your Canon DSLR with reasonable loading of your processor
and little to no jerking in playback.