Fetch is an excellent (S)FTP client. Very solid, clean and easy to use. Highly recommended and well worth checking out.

That said, I have switched to a different browser due to a few minor issues (which I reported a long time ago). But every program has its quirks and these may not bother you:
- If you click "Edit" on a file of unknown type, it will always ask whether to edit it as an image or a text file. Remote image editing may be a wonderful featurefor some, but I never use it so this is just intrusive. I want to be able to tell it to always edit as a text file and don't ask.
- If you use sftp and public key encryption (e.g. SSH Agent), Fetch insists on a password for the connection even though the password will just be ignored. If you use Fetch then you can avoid the hassle by saving dummy password so no big deal. But I'd rather not clutter up my keychain with meaningless entries and I'd rather be told something more sensible than "invalid password" if SSH Agent isn't running.

So I personally use Yummy FTP instead. It seems just as solid as Fetch and does not have the quirks mentioned above. Also, the author seems more responsive (which may explain the fewer quirks). On the other hand, it has one quirk of its own: one cannot copy URLs from Yummy FTP to Eudora because of a unicode issue I don't understand (and which doesn't happen with Fetch or any web browser).

(Also, if Pepper is your text editor: Yummy FTP has a workaround for a Pepper bug that allows it to display window titles for sftp remote edited files.)