Back when I didn't know crap about paralell and SCSI, I picked up a SCSI zip drive for my laptop and loved it. It was so fast and whenever my friend complained about his slow zip, I couldn't understand why. Now I know that my SCSI zip was about twice as fast as even the newer USB zips, so that gives you an idea. I still have my SCSI zip and use it to this day. I never bought more than 5 discs for it though. No thanks at $10 a pop and the price still hasn't changed 5 years later. It's still a great little way of backing up your stuff quick though.
OTOH, with the prices of cd burners today, I still don't know why people are buying zips. It's so much cheaper to just burn a disc.
Sal