User blog comment:Just loves to play/Bloodthirster/@comment-6301771-20130617165222

Depends on the champ. Jayce has good AD ratios but somewhat sub-par base damages, so a BT is a strong item on him. In addition, his cannon-form W is an autoattack modifier, so that's a lot of potential healing. Wukong's in a similar boat, at least early game. His ult only has a base damage of 80 over 4 seconds at rank 1, but has 480% AD scaling. A BT will help you FAR more than a Brutalizer with him early game.

In addition, it's easier to fill up a BT early game because of farming, so it can help you snowball. Keep that in mind when you purchase a BT: You still have to fill it, no matter when you buy it, and late game it can be hard to find that time.