It doesn't stack. It gets overwritten iirc.

A resto druid friend of mine:

[12:04] treecat: the only time replenishment would be worthwhile is for ragestarved beasties or..people who use energy/runic power
[12:04] treecat: and then it's ...still not that good
[12:04] treecat: crap talent

I tested it out when I was running resto in my 5 boxing group, and I never thought it was worthwhile.


An important thing to remember, the talent is Revitalize, not replenishment, it used to be named replenishment but it was changed because it was being confused with http://www.wowwiki.com/Replenishment Which, it just isn't meant to be like the multi class ability Replenishment.