Thanks to all for being so detailed in the feedback and in describing the issues that are being experienced. I know that most of these things are being looked into with tickets, are there any outstanding issues that are being experienced that are not being looked into within a ticket? If so I would like to ensure that we get a ticket opened for any of these issues so we can attempt to resolve the issues as quickly as possible.
In the PowerStore forum Jason has posted on a workaround for an issue regarding editing of the cart object and breaking shipping rules. If you are experiencing this issue you should take a look here to get at the updated file.