SilverFast works reliably with most UMAX scanners under Mac OS 10.4
Please note, there are different version of SilverFast ranging from SilverFast SE ($49) thru SilverFast SE Plus and SilverFast Ai up to SilverFast Ai STUDIO.
SilverFast SE Plus and SilverFast Ai STUDIO support the patented Multi-Sampling with Auto-Alignment to get rid of noise and increase dynamic range. http://www.silverfast.com/show/newsletter200608/en.html
This feature alone is worth the upgrade, but each version has also got NegaFix with over 120 different nagtive film profiles. Have a look at the highlights movie to see that you get phenomenal results from your Umax scanner!
SilverFast Ai - Umax
Professional scanner software.
Version: 6.6.0r5