The ones I'm doing for my gf are currently on size 2s, which I only have in regular Susan Bates (not QuickSilver). I thought hard enough to buy this pair in differing colors--and that is making a huge difference. As long as I'm paying attention, I can remember to knit only with pink together or only green. If I find myself knitting pink with green, I'll know I've made a mistake.
Does that make sense? Each circular has needles on each end of the same color, and they differ.
It rocks. Seriously. :)