Hi,
What do you want to know? I have used it to go from 4 to 5 and did so without error.
Does as it says read the help file for caveats such as doesnt copy call handlers, so you would need to add them to the new version, but it does copy the information about the call handler, this obviously fails if the call handler hasnt been created. Also download the Cobra videos, these are excellent and have been updated.
http://www.ciscounitytools.com/App_COBRAS.htm
If you want more info just ask
Paul
