D-MAC  I would concur with the comment about the developer being rather mercurial. I worked with him to give him feedback on the first few versions. His reaction was quite petulant and he only responded well to lavish praise. Without any thanks or acknowledgment, he implemented nearly all of my suggestions (that he had vigorously resisted).

I hope that his attitude has changed in the past couple of years.

It is still not good to openly criticize your competitors. The developer should take note of Wil Shipley's comments about customer feedback. FYI, Wil Shipley is the developer of Delicious Library and the founder of The OmniGroup (see his comments on his personal blog).  
(Version 10.2)

D-MAC  Really buggy...

My system has 2 monitors and Desktopple Pro just doesn't work well, at all.

After trying to re-install (and having deleted the preference file), NS* (navigation services) errors go to the Console (exceptions raised but not handled) and the preference pane shows a blank.

Developer is defensive about any feedback. One of the other utilities of this sort is the way to go, for now...  
(Version 1.2)

D-MAC  In my review, I mis-typed "does seem to appreciate..."

It should be "doesn't."  
(Version 1.2.2.10)

D-MAC  Functionality and import/export options are quite good.

However, the GUI design (or lack thereof) makes this application difficult to use and requires multiple repetitive steps to do simple tasks. The interface has many inconsistencies, controls/icons that are cluttered and too small, and a lack of overall consistency and usability.

If the (one-person shop) developer would consult a good GUI designer, and observe actual user workflow, then overhaul the interface, this application could become the top tool of its kind.

For efficient entry of subtitle or caption text, there are many better choices under US$100.

Additionally, there is no user manual, on-line help, or video tutorials (or other training). When feedback is given to the developer, he reacts quite defensively and does seem to appreciate or respect user input. All this for an application that costs nearly US$400.  
(Version 1.2.2.10)

D-MAC  Actually, QT plugins should contain the info about supported file formats, etc.

QT Player (or the entire QT framework) should "take note" of the file formats and filename extensions supported by any plugin loaded at startup, making this kind of hack unnecessary. The Perian developers should look into this...  
(Version 1.0.5)