Have you found the information you were looking for?
Fr. Hebert was a genious. He knew just what we needed. As you have observed, Fr. Hebert listed civil marriages and successions (wills, probate rec., etc.) from the area's courthouses without regard to creed or race.
Recently, The Birmingham News reported the Birmingham Library was rated second best in the nation for genealogy research.
I have a link to our library's catalog. Before I go to the library, I make a list of what I want to look at and arrive early while the books are still on the shelf. The Birmingham Library has all of Fr. Hebert's publications and lots more on Louisiana. For example, the library has a series of Computerized Marriage Records published by Looking for Bears, one for each parish. Another is Family Tree Maker CDs. Some are great some are not, but most have at least a grain of truth and provide clues. The library has the first 32 FTM Family Archieve CDs. The library also has the Census Index thru 1880 published on several CDs by the Church of Jesus Christ of Latter-day Saints. Our library has a subscription to the census online through Ancestry.com
Recently, I made copies of cemetery records I found in the Louisiana Genealogical Register. In order to save time, I make copies of information I need. That way, I always have a reference.
I too was curious about the SWLR CD, and like you, was reluctant to buy it, however, I have a friend in Houston who did buy it and she is very well pleased. Guess it depends on what you are looking for.
I have done extensive research on the families of Southwest Louisiana and plan to publish my research, probably on a CD.At present, I am editing my very large database. Editing is very time-consuming and boring, not nearly as much fun as doing the original research!