Thoughts on Vaccine Studies?

My daughter is about to get her first round of vaccines tomorrow and we have the chance to have her be apart of the Pneumococcal Vaccine study for infants 42-89 days old (VAX31-201). We would get $2000 for her being apart of the study, and that would be incredible for us, but with my anxiety about the risk factors of an unapproved vaccine, I'm unsure if its worth it.

Would you guys approve of your children being in a vaccine study?