I actually bought this lipstick based on the color in the tube, where it looks like a vampy dark red. This was foolish given that the color in the tube clearly did not match MAC's description... and it looks as described. MAC calls this a "mid-tone blue red" with a satin finish.
Although it's definitely on the darker side of medium, this is a very bright, cool-toned color. It's not fully opaque (so if you had, say, a mark on your lip, it would show through), but the color is very rich.
|MAC Just a Bite Swatch|
|MAC Just a Bite on Human Face|
|The "four hours and a meal" test.|
As always, MAC lipsticks cost $15 for 0.1oz ($150 per ounce).