It works pretty good if you have large cabinets where you are covering a big area. I had a lot of difficulty on smaller cabinets especially on the inside getting runs in the finish.
This is why I spray everything laying flat and assemble dry for perfect results.
This of course forces you to learn different assembly techniques.
You can compromise and leave backs off, spray them separately and attach later.
Spraying into a 3 sided corner and getting coverage with no runs is almost impossible.
As I've said the bottom line is everyone gets used to doing it the way they get the best results.
You have to learn, (I was trained) to spray rapidly (keep moving) with an airless.
I've seen a lot of self-taught people spray with the tip orientated so the pattern is horizontal when holding the gun vertical, this doesn't work well at all.
Your wrist has almost 180 degrees of motion let to right, as opposed to 45 or less up and down.
Breaking that habit will allow you to maneuver the gun quickly around corners for a more even coverage and far less runs.