This software is worth paying every penny. I use it all the time. Windows Explorer is too slow for me, and it produces a lot of crap files that make it become slower and slower. If you just move some files or do little things with it, Windows Explorer is enough. But if you work with many files all the time, or need fast, immediate tabbed browsing in multiple panels at the speed of thought, you NEED this software.
There are others, there are some that are free, but this one is the best and fastest, the easiest and the most robust. It is also the most customizable one, as you can customize everything.
It is a good program and buying it is a way to support a good programmer who is also very generous with the updates.