I am looking to buy a one step checkout solution and I tested your sandbox demo.
There is a problem however in your demo.
The Google auto complete does not fill the "City" field.
Can you check this?
Also. Is it possible to use the "1 column" layout, with custom blocks on the right?
I want a "2 column layout" with the checkout to the left, and banners etc. to the right.
Lastly will the product show taxes in the checkout? The demo has no taxes showing.