Ok bought Eye Tech Liquid Liners today, just stick with the Extreme (slimmer) one. The Bold one is new and larger. You get an opaque line on first stroke with the Extreme but a watered-down stroke with Bold.
Top-Bottom: Bold and Extreme with 1 stroke each, then 2 strokes, then 3 strokes. Bold one is barely there. Don't bother, you'll be returning this like I am.