The first version of Syncranator has just been released! It is version 0.9.0, not yet 1.0.0, because there is a known problem with the file selection. Make sure to either click on a directory in the list, or press Enter in the text field, to ensure your choice is registered.
Otherwise, this should be a self-explanatory, easy-to-use, simple, fast and free directory synchronisation tool. Try it out and let me know what you think!