It works as advertised on a 13-field E911 address form, picking up entered form data when right-clicking and copying, and re-entering it appropriately when right-clicking and pasting. One minor inconvenience in *some* situations is that if the form you're pasting has other fields that were empty when you copied, it doesn't erase those fields.
E.g. if you're updating address forms, the old address has a suite number, the new address that you're pasting in lacks a suite - you'll end up with an extraneous suite number. But it's pretty easy to erase the extraneous field before submitting, and it sure beats typing it all in manually ninety-seven times.
The ability to edit the stored values would be nice, but still, a helpful add-on, and very easy to use.