OBK!
Not unusual to get this during early morning rush off the ocean.....for instance arriving during night curfew and wanting to lose some time. The regulars will usually ask if a "250 knot descent" is OK.
Never a problem if we know; remember that ATC sometimes use reasonable expected performance to separate traffic.......please mention any significant variation from normal operating practice.......hardly ever a problem....but we need to know.
If this is a fleet-wide practice, and is significantly different to the way that other operators fly the same equipment, write to ATC ops who will notify all controllers to expect it.
As an example we've just been given a set of performance figures for the new Embraer...very handy.