Best Boosting Services?

I have been researching Android application boosting services, and I would like to see if any of you have input. I have found two such services that I would like to try.

The first is App2Top. People seem to like this one, but it costs $.10 for every download and I feel that this will add up quickly. (

The second is UpSwing, it is supposed to be available June 20th and you just pay a monthly fee. This service does not cap on how many downloads you can earn, just up to how many users they will have. They are having a free for one month promo so I might try it out. (

Let me know what your favorite services are.