FlexMail store: Internal or SD?

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I know that FlexMail 4 supports storage on SD card, but the manual raises some warnings about how WM grabs file handles when entering hibernation, therefore delays in mounting before read access can possibly cause corruption.

Two questions, please:

1) Is storing messages to SD on a TyTNII truly a potential problem, or are they just covering their butts? I'm using a SanDisk SDHC.

2) Would you place the stores in the /SD/MyDocuments folder or place them in the FlexMail program directory (I also have FlexMail installed to the card)? Not sure what the implications for going either way might be.

Just curious to know what ramifications I might have by going one way or the other.

Thanks!