I've only used this application for a few minutes but already noticed some glaring problems:

• The preferences sheet uses a cube animation when you switch between the different section panes, which looks really out of place, odd and totally confusing.
• Results for at least one dictionary (Spanish-English/TI!) showed up in raw HTML and were thus not readable at all.
• The dashboard widget looks just horrible, and its transparancy makes it hard to read. It also doesn't seem to actually work.

Again, I have only used the application a few minutes. At first glance, the basic application seems very useful, especially given the lack of similar applications on the Mac, but the above problems at the moment don't give me a lot of confidence to be willing to pay for it. The dashboard widget could use a complete redevelopment.