From the description, it doesn't sound at all different from the actual way cmd-tab is used.

I didn't notice this for awhile, but if you keep holding command down, you'll notice that the application name you'll be switching to stays up. Keep pounding on tab, and you'll switch right to the name of any given open app. Shift-command-tab cycles the opposite direction, just in case you overshoot, and you can activate shift at any point in your cycling process.

But, then, I don't do windows, and I haven't yet used that named utility, so I'm not sure how the native function differs.

All I know is that I won't bother to download it because OSX already does exactly what I need it to do with concern to application switching.