Personally I don't like this instruction, as what happens if the next sector gives further descent and you don't actually "level". I always use "make the level restriction by xxx and when able reduce speed" however there are the "chosen few" who have to not understand this one. If you are not actually issued a speed or speed band, then you can fly whatever speed you wish (until you level), the controller should use more control if they don't want you to slow down too early. The level restrictions in that area and many others are important for a variety of reasons so getting you down is our number one priority, you slowing down is further down the list in most cases.