The question was about Union inks, and yes, we use them all the time, the mixo systems for PMS colors. They are opaque, but let's be real, they will need underbasing. We favor the Wilflex Quick White for that. Yes autos are different, but not that different; you have to dial them in as opposed to changing your printing by hand, but you're usually trying to do the same thing. By hand you can adjust pressure, speed, downward force, etc. On the auto, you have to get it to do that, and once it's set, you're good. By hand, you simply can't replicate exactly from print to print, not talking about 1 color printing here, but multi color where changing pressures and speeds will make a difference.
Steve