Seeing as there is already the capability to run a built in ftp server on OS X why bother downloading and potentially paying for one?
Starting the OS X FTP Server
sudo -s launchctl load -w /System/Library/LaunchDaemons/ftp.plist
Stopping the OS X FTP Server
sudo -s launchctl unload -w /System/Library/LaunchDaemons/ftp.plist
You could even easily knock up an Automator app to start and stop this (sod it I might even make one myself).
Sourced from: http://osxdaily.com/2011/09/29/start-an-ftp-or-sftp-server-in-mac-os-x-lion/
