The great thing about the 'Micro-Dot Dispenser' is the piston springs back when you release the grip.
This takes the pressure off the solder paste and stops oozing.
No complicated compressed air machinery, no wires or motors. 
Laying down dots of paste is fast, accurate and the process is repeatable.
This is a good great ‘must have’ tool if you are doing a few boards and you don't have a stencil.
These YouTube videos give you an idea of how much paste is actually needed:
And
EDIT:
After using the tool for a few months, I had a problem with the dispenser insert pushing out of its mounting hole.
The solution was to solder a flange washer to the insert to prevent the insert from dislodging.
Since solder does not stick to stainless-steel (SS), use a SS M3 screw to keep the washer in place during the soldering process.
See the images below to see how to make the modification.
The manufacturer has said new batches will incorporate a flanged insert.
This is an indispensable tool on my work bench so it’s nice to have it working again !
