I've been using @dustsweeper ever since @bashadow recommended it to me. It works great and every penny you put in you will get back.

It has changed the way I think about voting, too. I used to refrain from voting on most comments because I was afraid of running out of VP, or creating dust votes. Now I put a small vote on every comment I receive knowing that the author can get a reward as long as they use dustsweeper.