I made this because I just switched from Mac to PC. On Mac I was using Transmit, which was super easy to use and looked pretty good.

I don't use FTP frequently - I just needed something basically to upload/download files.

After switching to windows, I couldn't find any decent FTP clients I liked. I tried Filezilla, Winscp, Cyberduck. They're all too busy and look like they're straight from XP... so I made this.

I guess I'm just not sure what you're talking about when you say "High Quality GUIs" when talking about Windows FTP clients specifically.