One caveat - while Reg DD may view the account as "free", since many financial institutions do NOT charge their own customers for cashing a check, then your customers may feel mislead. Are you charging them to cash a check on the account with the Credit Union, or are you charging them if they want to cash a check from the outside?
Literal compliance with Reg DD may make the regulators happy, but you should still take a look at it from the customer perspective and try to make sure your advertising does not leave someone with the feeling that they've been "had."
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CRCM,CAMS
Regulations are a poor substitute for ethics.
Just sayin'