Try to avoid speedbrakes like the devil will avoid the holy water.
The 5 P rules: Proper Planning Prevents Poor Performance!
IMHO if speedbrakes are needed, then something has gone wrong in the previous part of the descent.
Speedbrakes produce drag and are uncomfortble to passengers. If you need speedbrakes, you burned to much fuel in cruise or level flight earlier -> start your descent earlier.
There are other options that are more comfortable to passengers than speedbrakes.