Awesome! Doing a full fireproof box harddrive backup using it as we speak...
Doing so made me think of another potential improvement that I think could benefit the speed. Brennan added the UI change to only update the status bar to display the directory during analyzing. Why not do this for the actual synchronization process? There would be a "current directory" label and then a file label that would only get updated on files larger than X KB (probably 1024), since the larger files could still benefit from the sub-progress bar. Brennan or goatpunch could probably fairly easily test this.
Thanks to everyone mentioned (especially Justin) for keeping this app going. Nothing rocks more than simple, straightforward, well-coded apps for doing everyday tasks.