I think its worth it just so that you don't have to cary so many things around with you. Plus, it frees up device memory allowing your phone to run faster and smoother. But that is just my .02
Posted from my CrackBerry at wapforums.crackberry.com
I recently helped a friend optimize her Pearl. 10 or 11 pictures took up 9 or 10 mb of file free memory. This caused her berry to run really slow. Absolutely get a card and put your music, pictures, ring tones and other media on it. It is real easy to drag and drop files onto it.
Posted from my CrackBerry at wapforums.crackberry.com