I've been needing to migrate some sites for a while....and have just not felt up to it. I took a look at the migration tools... including this one (ver 3, 5 and now 7)...and just felt it wasn't worth migrating.
Today, I had a reason to spend some time with it..and I'm glad I did. Here's my experience, which may help some others with their migration.
I got errors on installation. Language & ini files if I remember. I ignored them (this was a test site), and went to the migrator...then Global Configuration. I put the appropriate hostname/DBname/DBuser/DBpassword that I was migrating from into the appropriate fields. I chose to migrate all tables & Backup.. everything came back ok except the menu items. I got a duplicate key error.
So... I deleted all content, links, categories, sections, menu items (except home..which can't be deleted), users,...everything.... and re ran the migrator.
It migrated everything just fine.
There are some issues with the content, category, section linking... but that's easy enough to fix.
Bottom line... it's better than a poke in the eye with a sharp stick :-)
Thanks for the extension...