Well, I guess I am the next guinea pig for this service. However, it is now simply called the "Settlement Premium Package". Long story short, my fiancee (British) and I (the American) and both have busy schedules and internationally travel. The main selling point was keeping my passport while waiting for an answer on the application. I am filing for the UK Fiance Visa to get married and settle in the UK.
So for the "Settlement Premium Package" review: I had my appointment in the Miami VFS Global center today. Showed up and had a lounge type room with coffee, teas, and snacks available. Biometrics are completed in the adjacent room. Another worker reviewed all of my documents and arranged them in his own barcode file system while I overlooked and made sure we didn't forget anything.
I think a key difference is they scan there and then on site, which is transmitted directly to Sheffield. I was told there is no involvement with the NY office. I waited around about 45 minutes while all of my documents were scanned and transmitted. There was another 20 minute wait for some response from the receiving end that the documents were received. All-in, it was quite painless and straightforward. I had all of my documents handed back to me, including my passport. Now, the waiting game to see how long it takes to get processed.
I will keep everyone updated.