It changes the speed of the answer, not the quality of the file. Premium processing commits the agency to act within a set period, and one of the actions it may take is issuing a request for evidence. A thin specialized-knowledge case simply receives that request sooner.
What money buys, and what it does not
Budget in three parts: government fees taken from the current USCIS schedule, optional processing elections, and the private cost of building the evidence. Hypothetical example: a Saint-Cyrille-de-Wendover flexographic ink formulator’s employer elects the fastest available processing to meet a customer commitment, and receives a detailed request for evidence within the guaranteed window, asking exactly what the petition had skimmed — how the knowledge differs from what the industry generally holds. The company then spends four weeks assembling internal formulation records it could have gathered before filing, and the elected speed has bought nothing.
The lesson is one of sequence: assemble the internal documentation, then decide whether speed is worth its price, and reserve budget for a response rather than assuming approval. Where a deadline is genuinely immovable, say so to the adviser at the outset, because the alternatives — a different beneficiary, a different classification, a shorter initial scope — need to be examined while there is still time to choose among them.