Externally disc (PC) with iTunes

Hi

Anyone any experience with this tool when porting an iTunes library that is on an PC external disc?

does it recognise users on PC and their iTunes libraries, can they be merged into one library across 3 users.

how does it deal with authorisation / de-authorisation issues on the old PC, don't need the pc's to remain authorised post the migration.

Have an couple of iPods and iPads that sync with the old PC, will these be recognised to the new iMac ?

Imac sat in the box waiting to try this apparently seamless process.

anything else to watch out for ?

thanks

Ian