I've started looking at the package - it's very nice!
Couple of minor issues - they didn't stop me installing
1 If state is entered with more than 2 chars, it barfs a request error. I found this cos we commonly use 3 chars as an abbreviation for our states (Australia).
2 Install did not find a pre-installed e-commerce of correct version, but I forced the install, and it seems OK. I haven't checked the integration with ecommerce extensively.