Happy FileZilla user here, on my FreeBSD laptop. I move tons of files from remote astronomical observatory routinely, sometimes need to define custom rules - what to download, upload, filter across folders, etc. Sometimes I need to push a file from very low data-rate link from somewhere in the middle of nowhere to the observatory, sometimes over a satellite link. Sometimes I want a throttled download of a large queue so I won't overload my connection and leave some bandwidth to other users. Also, I have a directory of different FTP servers I work with, it's easy to keep them in one place. So, there you have it.