I always check the movement of the mouth and its synchronisation in Mimic before saving it out as a poser file. Mimic is not meant to be a one-stop, click and go solution - it still takes tweaking and finesse to get it looking right. In Mimic, you can set it up to play the facial animation through - it takes a few minutes for it to create all the frames, but it gives you a much more accurate playback of the animation than the regular preview. Make sure you have it right in there before transfering it to Poser, and it should be fine.

Also, as ghelmer says, anything you can do to help Mimic hit the right phonemes in the first place, such as a phonetic textfile version of the dialogue you're speaking, makes things a little easier.

JonTheCelt