So... If I had access to pipes (such as doing a remodel) I would just replace them. It's easy, and completely resets the clock. If you have some corrosive issue then use PEX instead of copper.
The thing is that there is a lot of discussion about chemical leaching, long-term effects of chlorine, physical wear (from water moving over it) with regard to both copper and PEX. Those issues have been determined at this point for copper and PEX... I don't know about epoxy.
I would also think that some of the long-term effects are really dependent on the installers: Was it mixed properly, was it cleaned properly, etc. I'm not sure how it could get NSF certification with the variables on each installation.
Also, how are repairs/modifications handled?
If it wasn't accessible (slab), I might be more willing to consider it... but would really try to go with what has a long history of use instead.
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