Does anyone have any experience with digital voice recorders? The main use I would have for one is recording sermons and classes.

These are two of the ones I am currently considering:
Sony ICD-PX312 Digital Flash Voice Recorder

or
Olympus VN-8100PC Digital Voice Recorder 142600 (Silver and Black)

But by no means does that mean I'm only open to those two. Basically I'm interested in knowing if you have any experience with any.