I found textPuppet's lipsync to be somewhat more exaggerated and less accurate than Mimic's, from my earlier tests with the demo. The built-in text-to-speech didn't sound particularly convincing, compared to some of the better synthesizers out there. Also, I don't think the software is in development any more, so good luck on future support.

3dtrue has a similar product called PoserSpeak, which you might consider as an alternative:

http://www.3dtrue.com/poser/36.html