Hmm.... Just to update my earlier post, I downloaded a trial of DiffDoc and tested it against BeyondCompare. It has been a long time since I've used BC, because it processed pdf files just as effectively as - and more quickly than - DiffDoc. The only thing that I can see that limits BC are MS Office file comparisons - but it will do Word and Excel files and that's all I need it for so BC gets my vote here. Should probably revisit CompareIt, too... but work calls!