Finding a good FTP client is irritating. FTP is the type of thing that's almost worth leaving to the command line, but does benefit from a minimal GUI. But as soon as a good program becomes popular its authors decide they need to fill it with spyware, fees and unnecessary features. I used to use WS_FTP, then it stopped being free. I moved to CuteFTP, then its authors made it bloated with crap. I switched to SmartFTP, but it's recently also become filled with junk (and crash-prone).

So now I'm using FileZilla, and I'm pretty pleased with it. It's open source — hopefully the absence of a profit motive will keep it from getting junked up.