I have looked at Commander One, and potentially it is a really useful app for Mac. However, there are 2 absolute showstoppers for me.
1) no ability to change the editor from Textedit. This is major as if smart quotes are switched on in OS X, then Textedit can mess up config files by inserting 'curly quotes'.
2) no saving of edits to files stored on ftp servers.
Hmmm... come on guys, surely these can't be too hard to implement!