For me, Cyberduck was unreliable. It would constantly disconnect from my servers (VPS, shared hosting, Windows file server at work, even my local network server

For me, Cyberduck was unreliable. It would constantly disconnect from my servers (VPS, shared hosting, Windows file server at work, even my local network servers), it would crash occasionally, and very rarely it would lock up for a few seconds then run fine (relatively) for a while. This was the case both on my Mac Pro running Sierra and my Mac mini running El Cap (I have neither machine now; sold the Pro and the mini's logic board died). Command line ftp worked fine, Filezilla worked fine, and Transmit worked wonderfully on both machines. Anecdotal I know, but Cyberduck is not what it used to be, at least for me.