The model retains the neo-Classical synthesis vision of the MPS model -short-run output dynamics based on sticky prices and long-run Classical properties associated with price flexibility -- and therefore produces multiplier results, both in the short and longer runs, that are very similar to those produced by the MPS model.
The result is that the model produces, for the most part, what may be the best of two worlds – a modern form and traditional results! But the better articulated role of expectations in the new model also allows a richer analysis of the response to those policy actions which might have immediate impacts on inflation and/or interest rate expectations.