$500 Depression Trial

[Bestwish]

Hey everyone, I'm new to this forum but was hoping to get some opinions about whether or not people have had good luck participating in clinical trials. I recently received an invitation to participate in an upcoming clinical trial (http://www.fgglobal.com/research/4507/), but was slightly nervous because I've never done this before any don't know what to expect. Anyone done this before? Compensation up to $500 sounds pretty good, especially given that it's so relevant to me too.