It allows precision adjustments even at sub pixel levels. It is a fairly fast program also. The color masking technology displayed in this program was excellent and even as a beginner with this type of technology I found it fun and enjoyed working with the program. Mac OS version 7.1 or later. I've been playing with databases to try and organize my photography for about 15 years, and this is the best product for my purposes I've found yet.
Access is powerful, but requires a large investment of time and energy to learn.
But FileMaker Pro 4.1 is simple and easy. And while my needs aren't terribly complex, it could easily be used for complex databases. It's most important feature, in my opinion, is simplicity of operation. My primary use will be for cataloging my photo paperwork and film, with about 9,000 rolls, this is a long term process. FileMaker Pro will make this relatively easy, except for years of data entry that will still be required.