The eyeliner glides on easily and stays put all day. It's also great for creating both a polished or smudgy/smoky-eyed look. The brush is super-easy to use (full size available for $22). Individual pots of liner are $22.
Check out their site for other great deals and samples. Every order gets three samples, and if you shop between 9am to 2pm on Tuesdays or Thursdays, they throw in a free full-sized product. Plus, they always offer free shipping on any size order.