The developer of the extension (Stergios) is also extremely helpful and won't let you on your own until your problem is solved. I had some issues with shipping within Greece in version 2.1 and I contacted him for help. He replied immediately and managed to solve all my problems in a timely manner. He also released a new version (2.2) incorporating all the changes where everything works as expected. Thumbs up for Stergios as well!!!
One useful addition on this module would to be able to set free shipping for a country/state etc. based on the total price of the purchase (i.e. free shipping within Greece for deliveries over 100 Euros).