bezics yes, i was speaking of the smaller cup of the BS model. the CS has a larger color cup, but when i'm spraying broad coverage, i still thin my paint 50/50 and get a nice smooth, even coat on the subject each time, and no paint sticks to the walls as it goes down becuase it is too thin normally.
and yes, you can leave paint in the HP-CS for extended periods of time, just stick a tooth pick in the tiny air hole in the color cup cap. heck, i've even forgotten to empty the paint out of my hp-cs more that one time, and the paint stay in there over night. got to the bench the next day, found the incident, and cleaned it up with lacquer thinner and it sprayed good as new. the paint wasn't even dry, it had just separated from its carrier as all paints do when left sitting. later.