Don't judge how fast and easy things will be by how quickly you receive your first NOA from Vermont. All it means is they opened your envelope, assigned the application in it a registration (tracking) number, and deposited your check (probably their most important reason).
My experiences with the Vermont Service Center (and the St. Albans sub-district office) have been good. And I imagine the opening of the Missouri Service Center, now a nation clearing house for many types of applications, has certainly helped.
It's when things got into the State Dept.'s hands that everything came to a stop, making our less than 3 month trip through VCS take almost exactly one year to get my wife and son here to the US. And I had the most powerful lawyer in Vt helping me -- Sen. Pat Leahy, ranking member of the US. Senate's Judiciary Sub-committee on Immigration. State basically said, "Up your's... It's not late until it has sat here, untouched, for five months..."