Why not use the OS X built in ftp? In other words, from the Finder click on Go and then Connect to Server and then enter an ftp:// URL including username and password if necessary. Then you get a finder window of the ftp mount.
Also, last time I tried any of the GUI based ftp apps like Fetch, they had horrendously slow transfer rates, as much as 2-3x slower than command line. So if you aren't going to use the Finder ftp, then I recommend going command line, such as lftp. It can do ftp, scp, as well as other protocols and has means for batching and resumption of partial transfers.