Adorna-- I agree that a 2 pixel or higher brush is easier to work with, and if you use pressure settings, you can make it taper for a more pleasing stroke. I tried some experiments expanding things up and then bringing them back down. One interesting thing I found was that when you draw a 1-pixel line and then reduce it 50%, you get a 1 pixel line at about 50% opacity. That would suggest that you use opacity to create an illusion of fine lines when it's inconvenient to expand and reduce. And yes, it does appear after all that Photoshop does anti-alias those lines. It's just hard to get a smooth stroke sometimes, even though I have a wacom tablet.