I used it for about 1000 pages I photographed with a DSLR. The automatic dewarping rarely worked for me, so I ended up doing it manually.
It likely didn't help that many of the pages were typed carbon copies or hand-written. For the former I had to put another piece of paper behind the page to prevent the next page from bleeding through.
That said, I managed to get the job done, though it took a couple of weeks. Next is to capture the metadata (author, date written, ...). There were a lot of one page letters in the documents I copied.
Would love to try out another tool that could read from the ScanTailor project file to get the page segmentation or even the warping I did manually to improve on the result.
[1] http://scantailor.org/