PXQUIM  I'm ripping LPs, so I have a 15-30 minute sound recording. To remove "pops", I use the "Interpolate" filter over very small durations. If I do a lot of such edits, the App starts to look confused (for example, the display does not seem to update correctly) and eventually crashes.

The last time the app crashed when I tried to save the file. The OS later recover 248 .caf files, so perhaps I did over 200 edits?

This is on a iBook G4 1.0MHz with 768MB RAM, recording through a Griffin iMic.

Why am I complaining here? Well, trying to report the issue to Freeverse support using their Web form results in the error "Your message did not clear our spam filter". So, think twice before buying if you ever need support.  
(Version 3.6)

PXQUIM  Very fast at analyzing large hierarchies with hundreds of folders; it figures out that there is nothing to synchronize in a few seconds (if you allow "ls-R" in the preferences).

Uploads reliably without failing in the middle or skipping files.

Upgrading from Cyberduck, which somehow managed not to upload over 1000 files scattered over several folders.

Finally, the price is right for such an utility.  
(Version 1.7.2)