I am not from Hendricks County, Indiana, neither me nor my husband has Indiana ancestors, and I've only lived here for about two years. However, I have found probate records in general to be VERY helpful in my research, particularly for my husband's family. I have had easy access to his ancestors' probate records because they had been digitized and put online at some point in the past (probably by volunteers). I realize the importance of a project like this, even though it will not directly affect my own research.
According to the project website, these probate records have been just sitting in the basement of the county courthouse; they had never been indexed or microfilmed or open for public access. Papers related to each probate case were folded and bundled into small envelopes. Volunteers had already alphabetized the packets and put easy-to-read name and date labels with each one: