Ah, I had forgotten about that PowerBook thread and did not realize you had acted on it.
Thanks to Bunsen's post I found the article that discusses performance:
http://lowendmac.com/mail/0801mb/0118.html#4
However, it may be moot as my e-mail to him bounced and the SCSI adapter is "Out of Stock". I might go ahead and get one of the IDE drives to try with a SCSI to IDE adapter, since if it doesn't work out, I can always throw it into my aging (and complaining) IDE drive in my old PowerBook G4. Though if I go that route, I might as well go with something a little less suspect like this reasonably priced product: http://www.addonics.com/products/flash_memory_reader/ad44midecf.asp discussed here: http://lowendmac.com/reviews/07/flash.html ... the only thing that gives me pause is that it says it requires OS 8.6 and above.