Essentially, they all promise to scan 35mm film, and with an adapter, it can also do APS. However, promises are just that - empty for most of these scanners. This one however does it all:
- Digital ICE (you absolutely need this for cleaning images after they are scanned in - do NOT get a scanner without this, you'll be sorry!). - 2,820 dpi resolution (you always want to scan as high as possible. You can always sample down and lower resolution, but you can't go the other way without quality degradation) - Fast scanning speeds (with the exception of $2,000 models, this is the fastest scanner around. On my Windows PC is takes around 30 secs. On a Mac is takes 10 or so per FINAL scan.)
The problem with the Photosmart 20 is that it doesnt have a proper ICE image cleaner and film scans poorly. The Nikon coolscan doesnt have a good dut guard, and you end up with dust on your negatives/slides, which scans in horribly! UGH!
This one has virtually no weakness. SCSI connection makes it extremely fast! Get it and you'll be happy you did.
There are some compromises to contend with: the bundled software is mediocre, but many prefer Vuescan software which offers much more functionality for film scanning. Minolta is not going to release a OS X compatible driver, and the scan speed is much slower than the manufacturer specs in multiscan mode which is essential to minimize channel noise. However these are reasonable tradeoffs for the reasonable price point of the Dimage and outstanding 8x10 to 11x14 color prints which result from a good scan.