Just for those who are wondering, I have been doing some comparative scans of slides with my Epson 2450 and Minolta Dimage Scan Dual II. What I am finding is that the Epson is delivering a more usable scan. Basically I think that the diffused light source in the lid is hiding more scratches/dust and the resultant scan is smoother - less grainy looking. Both deliver about 2400 dpi resolution. The scan software that is working best for this operation is the supplied Silverfast product. I haven't tried comparing negatives yet.
Any questions, let me know. Bruce