Settlement package in my opinion surpasses the NY scanning doc center - but i don't know if it's really worth 1900$. The regular priority is around 580$ so basically you're paying triple for keeping passport, skipping NY part of it, and a 30day guarantee?
Did you actually read that somewhere? AFAIK, there is no guarantee, even with the Settlement Premium Package.
Yeah, there is no 30-day guarantee - that's just the target they've set for processing all priority applications, whether they go through New York or a premium centre - the premium service simply includes the same settlement priority service that everyone else who pays $793 gets.
In fact, when the Settlement Premium Service was introduced, it was taking MUCH longer than regular priority. Back in January, we had normal priority applications acknowledged by Sheffield in 2 days and processed in 2 weeks, while if you used the premium service, it would take 2-3 weeks for Sheffield to acknowledge your application and another 1.5 months to get the visa.
Also, with the premium service, you're not really 'skipping the NY part'... you're just having your documents go through the same scanning process as in NY, just at a different location.
So, really, all you're paying the extra $1100 for is the option to keep your passport (and maybe get your visa a week or two earlier than if you'd only paid $793).