Digital ICE is actually pretty neat technology. I do not own a flatbed, but my Nikon Coolscan does come with Digital ICE3 (cube).
I have scanned some bad scratched negatives, and it turns out good. Unlike the Dust and Scratch filter in
PS, Digital Ice does not soften the image. In fact, when I compare my scans with and without Digital ICE applied, the difference is hardly visible.
However, Digital ICE DOES NOT work with black-and-white negatives. I do know why, but I can always shoot and and convert my image to b&w in
PS.