Sync Assistant is an ergonomic tool to compare two directories or directory trees and assist with file alignment. A typical utilization of Sync Assistant is when you want to keep a copy of your data files (which you frequently create or update) in a different disk (hard or floppy) for backup purpose. By the way, It is strongly recommended to do that as a daily habit, as the hard disk of your PC will crash sooner or later, without any prior warning. Sync Assistant compares two directory trees and tells you the differences in a simple form, allowing you to selectively align files in either direction, just by clicking on buttons or by dragging and dropping file names. Sync Assistant does not perform any automatic change after detecting and showing the differences between two directory trees. All alignments must be explicitly requested by you.
I've searched for a program to automatically compare and assess directories for years - and this ended the search. So simple you'll be up and running as soon as you download and install it.
Cons
There's nothing to complain about - it's small, fast, accurate and easy to use.
Summary
Try it, buy it. You'll save hours and sleep better when you are sure you've got all the latest files in the directories you expect them. And it's CHEAP!