Tracy,
SDT is a wonderful product - have been using it for a few years now. Like Mark, I also use it for indexing, repairing, and updating table structures when patches are sent to clients. These functions alone, for me, made SDT worth more than its weight in gold.
Additionally, Doug provides great support on the product. I remember having a problem during a table update where a new field was added that had a default value, and Doug dealt with it immediately and had a fix for me within a day or two.
I would highly recommend it.
Laterness,
Jon
Jon Rosenbaum
Devcon Drummer