We thought long and hard about using camtasia because of some
audio features that made things far easier than captivate. However,
camtasia has a issue with removing their player controls that
leaves a 1 pixel white border around their swfs (among other
issues).
We went rounds with their tech support, and while they were
nice, they had no idea how to fix it, since it dealt with a core
issue behind how they decided to use flash 8.
Short answer...camtasia did not work for us. We're started
pouring our efforts into making captivate a better product, so if
you have any suggestions there that you'd like us to pass on,
please let me know.