Thanks for creating a much needed product. I wanted to give and solicit some feedback of my experience so far.
I am in the process of creating a very simple online store for a band and your shopping cart seems perfect however I have run into several issues.
When setting up categories for the first time I did not understand I had to actually add the default category. By the definition of default I understood that to mean it was already set up. Plus the button to do so is at the bottom of the screen - so the context on the button didn't help at first. In your help box you might want to explain that the user actually has to add the default category before they can continue.
The first time I did a test order I kept getting a shipping error and couldn't check out. I finally realized that I had to turn on the USPS rates if I didn't select a different shipping type other than the default. Again it might be helpful for the user if a note is put in the help box next to the weight form field that it will only work if the USPS option has been turned on.
For PayPal testing purposes I was not able to use any of my Sandbox credit cards because the expiration date ends in 2017. Your drop down only goes to 2016.
After completing my first test order I did not receive an email to admin account notifying me of the purchase. I understand that you can choose to receive an email based on category but isn't an email sent out every time a purchase is made? Maybe this is because I'm only using the testing payment gateway? I assume PayPal would send an email referencing the transaction?
And lastly, is there any more documentation on how to use the xml feed? I would like to integrate it into the Wordpress backend somehow.
Thanks for your time and for creating this wonderful product.