They are correct. iFile works great for giving you a Finder styled file manager inside the idevice. iFile is also the best utility for doing things like decompressing etc.

If you want to see the files inside your phone in a file manager on your computer most people go with OpenSSH/Cyberduck. Personally I like Netatalk which makes your device just show up as though it was an external hard drive and breaks down the folder hierarchy the same any Linux distro.

You need to jailbreak first, then install iFile from cydia. It's not free but it works great.