Thanks for your input.Yes. I am use "The Checkout Module" and already tested this module in question.
All modules good. "The Checkout Module" has not the custom filed features, but has some benefits.
At all I choose OPC by ETS-soft. This is best developer on presta marketpale for my mean. Always good and perfect code, super technical support.
It is good to know that ETS-soft is a good developer. There is a lot of crappy code out there that I want to avoid.