Great for big workgroups that need to keep dozens or more 'shortcuts" to FTP sites and settings "in sync" for all users as you can manage all settings and "shortcuts" by copying an XML file to the users.
Unlike Fetch, which relys on the difficult-to-manage Apple Keychain for shortcut passwords.
Don't know how Cyberduck or SImple FTP handles that --

BUT it is old Windows ugly and confusing to a Mac user.
Yes fast, stable and solid, once you get used to doing things the old WIndows way.

For big workgroups or managing an FTP server, yes.
For indiviudal users, probably not worth the learning curve unless you are used to Windows version.

Help files are almost all WIndows-specific (and therefor NOT helpful)