Not the best
I tested this app on an FTP connection I have at home. It allows the connection and lets you browse through the files, but uploading files from your phone to the FTP is a nightmare. Most times the app will crash, some files dont copy through and if its a picture, good luck finding out witch picture didnt go through. Id look elsewhere for a 2 way connection FTP app
Idyaz about
iTransfer - File Transfer Tool