They're reciprocal links. That means they're not amazingly helpful, and potentially harmful. The automated system scares me. How does it know which links are relevant to yours? Besides, automated systems will surely be abused by the less scrupulous, so one day you are likely to wake up and find your site is no longer ranking or even indexed.
Yup, seems like you don't have much control over what scripts appear on your page. I wouldn't trust them. Skinny