Effect of Activating PDMWorks Revision Table on DWG

There is an optoin to have the PDMWorks revision and note belinked (drive) the revision table on a drawing. Does anyone usethis feature? Does it work?
What happens to all exising drawings in the vault which havemanually created tables - will data be lost??

This seems like such a wonderful feature, but I'm afraid to try it

Can I establish a second vault for test purposes?SolidworksSolidworks Pdm enterprise Pdm