I have been using SmartFTP till now as I found it quite user friendly and convenient. But recently I started getting "Transferred Failed" error in the output window just after the "Transfer successful" message. I found it quite weird and noticed that SmartFTP failed to transfer some of the files whenever I FTPd multiple files at once. This prompted me to look for some other better FTP software as I felt too lazy to go to SmartFTP forums and wait for someone there to help fix this "strange" exception.
Luckily I found Core FTP Lite, which was free and quite reliable. And I never saw that error again!
Here is the download link:
http://www.coreftp.com/download.html